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電容表

一種便攜式遠(yuǎn)距離熱量計(jì)查表器系統(tǒng)設(shè)計(jì)

信息技術(shù)的日新月異要求發(fā)展新的技術(shù)來提高熱量計(jì)量收費(fèi)的可靠性,改變過去熱力站數(shù)據(jù)采集靠人工抄表的落后方法,以實(shí)現(xiàn)集中供熱系統(tǒng)管理的全面自動化。便攜式查表器是一種新興的現(xiàn)場數(shù)據(jù)采集技術(shù)。本文所設(shè)計(jì)的查表器通過RS485 接口從現(xiàn)場使用的熱量計(jì)中遠(yuǎn)距離采集數(shù)據(jù),它采用Intel 80C196 作為CPU, 240×128 點(diǎn)陣的液晶作為顯示器,并擴(kuò)展了256K 的非易失性RAM 來保存30 個(gè)熱力站的所有運(yùn)行數(shù)據(jù)。信息革命沖擊著各行各業(yè),傳統(tǒng)的數(shù)據(jù)采集方式已不適應(yīng)信息時(shí)代的需要。常規(guī)的現(xiàn)場儀表數(shù)據(jù)采集方法要靠查表員手工來完成。有些儀表安裝在危險(xiǎn)場所,如在地下的熱水管道系統(tǒng),查表員有時(shí)會冒生命危險(xiǎn)。目前公用事業(yè)的發(fā)展,迫切要求改變傳統(tǒng)的數(shù)據(jù)采集方式,以更方便、更快捷的服務(wù)來適應(yīng)信息時(shí)代的到來。微處理器、存儲器、VLSI, A/D 轉(zhuǎn)換等技術(shù)的迅速發(fā)展,使得現(xiàn)場儀表與控制中心之間傳遞的不再是傳統(tǒng)的模擬信號,而是數(shù)字信號。數(shù)字信號不但避免了模擬信號傳輸過程中存在的精度降低、信號衰減、易引入干擾信號等的不足,而且顯著提高了信號的可靠性,它為采用新的數(shù)據(jù)采集技術(shù)提供了可能。

標(biāo)簽： 便攜式熱量計(jì) 查表器系統(tǒng)設(shè)計(jì)

上傳時(shí)間： 2013-11-17

上傳用戶：tzl1975
用AT89C2051單片機(jī)制作的數(shù)字電容表

用AT89C2051單片機(jī)制作的數(shù)字電容表：AT89C2051作為AT89C51的簡化版雖然去掉了P0、P2等端口，使I/O口減少了，但是卻增加了一個(gè)電壓比較器，因此其功能在某些方面反而有所增強(qiáng)，如能用來處理模擬量、進(jìn)行簡單的模數(shù)轉(zhuǎn)換等。本文利用這一功能設(shè)計(jì)了一個(gè)數(shù)字電容表，可測量容量小于2微法的電容器的容量，采用3位半數(shù)字顯示，最大顯示值為1999，讀數(shù)單位統(tǒng)一采用毫微法（nf），量程分四檔，讀數(shù)分別乘以相應(yīng)的倍率。

標(biāo)簽： C2051 2051 89C AT

上傳時(shí)間： 2013-11-19

上傳用戶：wuyuying
4x4鍵盤的設(shè)計(jì)與制作

三種方法讀取鍵值􀂄 使用者設(shè)計(jì)行列鍵盤介面，一般常採用三種方法讀取鍵值。􀂉 中斷式􀂄 在鍵盤按下時(shí)產(chǎn)生一個(gè)外部中斷通知CPU，並由中斷處理程式通過不同位址讀資料線上的狀態(tài)判斷哪個(gè)按鍵被按下。􀂄 本實(shí)驗(yàn)採用中斷式實(shí)現(xiàn)使用者鍵盤介面。􀂉 掃描法􀂄 對鍵盤上的某一行送低電位，其他為高電位，然後讀取列值，若列值中有一位是低，表明該行與低電位對應(yīng)列的鍵被按下。否則掃描下一行。􀂉 反轉(zhuǎn)法􀂄 先將所有行掃描線輸出低電位，讀列值，若列值有一位是低表明有鍵按下；接著所有列掃描線輸出低電位，再讀行值。􀂄 根據(jù)讀到的值組合就可以查表得到鍵碼。4x4鍵盤按4行4列組成如圖電路結(jié)構(gòu)。按鍵按下將會使行列連成通路，這也是見的使用者鍵盤設(shè)計(jì)電路。 //-----------4X4鍵盤程序--------------// uchar keboard(void) { uchar xxa,yyb,i,key; if((PINC&0x0f)!=0x0f) //是否有按鍵按下 {delayms(1); //延時(shí)去抖動 if((PINC&0x0f)!=0x0f) //有按下則判斷 { xxa=~(PINC|0xf0); //0000xxxx DDRC=0x0f; PORTC=0xf0; delay_1ms(); yyb=~(PINC|0x0f); //xxxx0000 DDRC=0xf0; //復(fù)位 PORTC=0x0f; while((PINC&0x0f)!=0x0f) //按鍵是否放開 { display(data); } i=4; //計(jì)算返回碼 while(xxa!=0) { xxa=xxa>>1; i--; } if(yyb==0x80) key=i; else if(yyb==0x40) key=4+i; else if(yyb==0x20) key=8+i; else if(yyb==0x10) key=12+i; return key; //返回按下的鍵盤碼 } } else return 17; //沒有按鍵按下 }

標(biāo)簽： 4x4 鍵盤

上傳時(shí)間： 2013-11-12

上傳用戶：a673761058
PIC系列單片機(jī)手冊

PIC系列單片機(jī)手冊第1 章簡介 1-1簡介 ................................................................................................................................................................. 1-2本手冊的宗旨 ................................................................................................................................................... 1-3器件結(jié)構(gòu) .......................................................................................................................................................... 1-4開發(fā)支持 .......................................................................................................................................................... 1-6器件種類 .......................................................................................................................................................... 1-7格式和符號的約定 ......................................................................................................................................... 1-12相關(guān)文檔 ........................................................................................................................................................ 1-14相關(guān)應(yīng)用筆記 ................................................................................................................................................. 1-17版本歷史 ........................................................................................................................................................ 1-18第2 章振蕩器 2-1簡介 ................................................................................................................................................................. 2-2振蕩器配置 ...................................................................................................................................................... 2-2晶體振蕩器 / 陶瓷諧振器 ................................................................................................................................. 2-4外部RC 振蕩器 ............................................................................................................................................. 2-124MHz 內(nèi)部 RC 振蕩器 ................................................................................................................................... 2-13休眠模式對片內(nèi)振蕩器的影響 ........................................................................................................................ 2-17器件復(fù)位對片內(nèi)振蕩器的影響 ........................................................................................................................ 2-17設(shè)計(jì)技巧 ........................................................................................................................................................ 2-18相關(guān)應(yīng)用筆記 ................................................................................................................................................. 2-19版本歷史 ........................................................................................................................................................ 2-20第3 章復(fù)位 3-1簡介 ................................................................................................................................................................. 3-2上電復(fù)位、上電延時(shí)定時(shí)器、起振定時(shí)器、欠壓復(fù)位和奇偶校驗(yàn)錯(cuò)誤復(fù)位 ...................................................... 3-4寄存器和狀態(tài)位的值 ...................................................................................................................................... 3-10設(shè)計(jì)技巧 ........................................................................................................................................................ 3-16相關(guān)應(yīng)用筆記 ................................................................................................................................................. 3-17版本歷史 ........................................................................................................................................................ 3-18 第4 章架構(gòu) 4-1簡介 ................................................................................................................................................................. 4-2時(shí)序圖/ 指令周期 ............................................................................................................................................ 4-5指令流/ 流水線 ................................................................................................................................................ 4-6I/O 端口描述 .................................................................................................................................................... 4-7設(shè)計(jì)技巧 ........................................................................................................................................................ 4-12相關(guān)應(yīng)用筆記 ................................................................................................................................................. 4-13版本歷史 ........................................................................................................................................................ 4-14 第5 章 CPU 和ALU 5-1簡介 ................................................................................................................................................................. 5-2指令的一般格式 ............................................................................................................................................... 5-4中央處理單元（CPU） .................................................................................................................................... 5-4指令時(shí)鐘 .......................................................................................................................................................... 5-4算術(shù)邏輯單元（ALU） .................................................................................................................................... 5-5狀態(tài)寄存器 ...................................................................................................................................................... 5-6OPTION_REG 寄存器 ..................................................................................................................................... 5-8電源控制寄存器 ............................................................................................................................................... 5-9設(shè)計(jì)技巧 ........................................................................................................................................................ 5-10相關(guān)應(yīng)用筆記 ................................................................................................................................................. 5-11版本歷史 ........................................................................................................................................................ 5-12第6 章存儲器構(gòu)成 6-1簡介 ................................................................................................................................................................. 6-2程序存儲器構(gòu)成 ............................................................................................................................................... 6-2數(shù)據(jù)存儲器構(gòu)成 ............................................................................................................................................... 6-8初始化 ........................................................................................................................................................... 6-14設(shè)計(jì)技巧 ........................................................................................................................................................ 6-16相關(guān)應(yīng)用筆記 ................................................................................................................................................. 6-17版本歷史 ........................................................................................................................................................ 6-18第7 章數(shù)據(jù)EEPROM 7-1簡介 ................................................................................................................................................................. 7-2控制寄存器 ...................................................................................................................................................... 7-3EEADR ............................................................................................................................................................ 7-4EECON1 和EECON2 寄存器 .......................................................................................................................... 7-4從EEPROM 數(shù)據(jù)存儲器中讀數(shù)據(jù) .................................................................................................................... 7-5向EEPROM 數(shù)據(jù)存儲器中寫數(shù)據(jù) .................................................................................................................... 7-5寫校驗(yàn) ............................................................................................................................................................. 7-6誤寫操作保護(hù) ................................................................................................................................................... 7-7代碼保護(hù)配置下的數(shù)據(jù)EEPROM 操作 ............................................................................................................. 7-7初始化 ............................................................................................................................................................. 7-7設(shè)計(jì)技巧 .......................................................................................................................................................... 7-8相關(guān)應(yīng)用筆記 ................................................................................................................................................... 7-9版本歷史 ........................................................................................................................................................ 7-10第8 章中斷 8-1簡介 ................................................................................................................................................................. 8-2控制寄存器 ...................................................................................................................................................... 8-5中斷響應(yīng)延時(shí) ................................................................................................................................................. 8-10INT 和外部中斷 .............................................................................................................................................. 8-10中斷的現(xiàn)場保護(hù) ............................................................................................................................................. 8-11初始化 ........................................................................................................................................................... 8-14設(shè)計(jì)技巧 ........................................................................................................................................................ 8-16相關(guān)應(yīng)用筆記 ................................................................................................................................................. 8-17版本歷史 ........................................................................................................................................................ 8-18第9 章 I/O 端口 9-1簡介 ................................................................................................................................................................. 9-2PORTA 和TRISA 寄存器 ................................................................................................................................ 9-4PORTB 和TRISB 寄存器 ................................................................................................................................ 9-6PORTC 和TRISC 寄存器 ................................................................................................................................ 9-8PORTD 和TRISD 寄存器 ................................................................................................................................ 9-9PORTE 和TRISE 寄存器 ............................................................................................................................... 9-10PORTF 和 TRISF 寄存器 ............................................................................................................................... 9-11PORTG 和TRISG 寄存器 .............................................................................................................................. 9-12GPIO 和TRISGP 寄存器 ............................................................................................................................... 9-13I/O 編程注意事項(xiàng) ........................................................................................................................................... 9-14初始化 ........................................................................................................................................................... 9-16設(shè)計(jì)技巧 ........................................................................................................................................................ 9-17相關(guān)應(yīng)用筆記 ................................................................................................................................................. 9-19版本歷史 ........................................................................................................................................................ 9-20第10 章并行從動端口 10-1簡介 ............................................................................................................................................................... 10-2控制寄存器 .................................................................................................................................................... 10-3操作 ............................................................................................................................................................... 10-4休眠模式下的操作 ......................................................................................................................................... 10-5復(fù)位的影響 .................................................................................................................................................... 10-5PSP 波形 ....................................................................................................................................................... 10-5設(shè)計(jì)技巧 ........................................................................................................................................................ 10-6相關(guān)應(yīng)用筆記 ................................................................................................................................................. 10-7版本歷史 ........................................................................................................................................................ 10-8 第11 章 TIMER0 11-1簡介 ............................................................................................................................................................... 11-2控制寄存器 .................................................................................................................................................... 11-3操作 ............................................................................................................................................................... 11-4TMR0 中斷 .................................................................................................................................................... 11-5Timer0 外部時(shí)鐘的使用 ................................................................................................................................. 11-6TMR0 的預(yù)分頻器 ......................................................................................................................................... 11-7設(shè)計(jì)技巧 ...................................................................................................................................................... 11-10相關(guān)應(yīng)用筆記 ............................................................................................................................................... 11-11版本歷史 ...................................................................................................................................................... 11-12第12 章 TIMER1 12-1簡介 ............................................................................................................................................................... 12-2控制寄存器 .................................................................................................................................................... 12-3Timer1 工作在定時(shí)器模式 ..............................................................................................................................12-4Timer1 工作在同步計(jì)數(shù)器模式 ....................................................................................................................... 12-4Timer1 工作在異步計(jì)數(shù)器模式 ....................................................................................................................... 12-5Timer1 振蕩器 ............................................................................................................................................... 12-7休眠操作 ........................................................................................................................................................ 12-9用CCP 觸發(fā)器的輸出將Timer1 復(fù)位 ............................................................................................................. 12-9Timer1 寄存器（TMR1H:TMR1L）的復(fù)位 .................................................................................................... 12-9Timer1 預(yù)分頻器 ............................................................................................................................................ 12-9初始化 ......................................................................................................................................................... 12-10設(shè)計(jì)技巧 ...................................................................................................................................................... 12-12相關(guān)應(yīng)用筆記 ............................................................................................................................................... 12-13版本歷史 ...................................................................................................................................................... 12-14第13 章 TIMER2 13-1簡介 ............................................................................................................................................................... 13-2控制寄存器 .................................................................................................................................................... 13-3定時(shí)器時(shí)鐘源 ................................................................................................................................................. 13-4定時(shí)器TMR2 和PR2 周期寄存器 .................................................................................................................. 13-4TMR2 匹配輸出 ............................................................................................................................................. 13-4將Timer2 的預(yù)分頻器和后分頻器清零 ........................................................................................................... 13-4休眠操作 ........................................................................................................................................................ 13-4初始化 ........................................................................................................................................................... 13-5設(shè)計(jì)技巧 ........................................................................................................................................................ 13-6相關(guān)應(yīng)用筆記 ................................................................................................................................................. 13-7版本歷史 ........................................................................................................................................................ 13-8第14 章比較/ 捕捉/ 脈寬調(diào)制(CCP) 14-1簡介 ............................................................................................................................................................... 14-2控制寄存器 .................................................................................................................................................... 14-3捕捉模式 ........................................................................................................................................................ 14-4比較模式 ........................................................................................................................................................ 14-6PWM 模式 ..................................................................................................................................................... 14-8初始化 ......................................................................................................................................................... 14-12設(shè)計(jì)技巧 ...................................................................................................................................................... 14-15相關(guān)應(yīng)用筆記 ............................................................................................................................................... 14-17版本歷史 ...................................................................................................................................................... 14-18第15 章同步串行口（SSP） 15-1簡介 ............................................................................................................................................................... 15-2控制寄存器 .................................................................................................................................................... 15-3SPITM 模式 .................................................................................................................................................... 15-6SSP 模塊的I2CTM 操作 ............................................................................................................................... 15-16初始化 ......................................................................................................................................................... 15-26設(shè)計(jì)技巧 ...................................................................................................................................................... 15-28相關(guān)應(yīng)用筆記 ............................................................................................................................................... 15-29版本歷史 ...................................................................................................................................................... 15-30第16 章基本同步串行口（BSSP） 16-1簡介 ............................................................................................................................................................... 16-2控制寄存器 .................................................................................................................................................... 16-3SPITM 模式 .................................................................................................................................................... 16-6SSP 模塊的I2CTM 操作 ............................................................................................................................... 16-15初始化 ......................................................................................................................................................... 16-23設(shè)計(jì)技巧 ...................................................................................................................................................... 16-24相關(guān)應(yīng)用筆記 ............................................................................................................................................... 16-25版本歷史 ...................................................................................................................................................... 16-26第17 章主同步串行口（MSSP） 17-1簡介 ............................................................................................................................................................... 17-2控制寄存器 .................................................................................................................................................... 17-4SPITM 模式 .................................................................................................................................................... 17-9SSP 模塊的 I2C™ 操作 ............................................................................................................................... 17-18I2CTM 總線的連接注意事項(xiàng) ........................................................................................................................... 17-56初始化 ......................................................................................................................................................... 17-57設(shè)計(jì)技巧 ...................................................................................................................................................... 17-58相關(guān)應(yīng)用筆記 ............................................................................................................................................... 17-59版本歷史 ...................................................................................................................................................... 17-60第18 章 USART 18-1簡介 ............................................................................................................................................................... 18-2控制寄存器 .................................................................................................................................................... 18-3USART 波特率發(fā)生器（BRG） ..................................................................................................................... 18-5USART 異步工作模式 ................................................................................................................................... 18-8USART 同步主控模式 .................................................................................................................................. 18-15USART 同步從動模式 ................................................................................................................................. 18-19初始化 ......................................................................................................................................................... 18-21設(shè)計(jì)技巧 ...................................................................................................................................................... 18-22相關(guān)應(yīng)用筆記 ............................................................................................................................................... 18-23版本歷史 ...................................................................................................................................................... 18-24第19 章參考電壓模塊 19-1簡介 ............................................................................................................................................................... 19-2控制寄存器 .................................................................................................................................................... 19-3配置參考電壓 ................................................................................................................................................. 19-4參考電壓精度 ................................................................................................................................................. 19-5休眠模式下的操作 ......................................................................................................................................... 19-5復(fù)位的影響 .................................................................................................................................................... 19-5連接注意事項(xiàng) ................................................................................................................................................. 19-6初始化 ........................................................................................................................................................... 19-7設(shè)計(jì)技巧 ........................................................................................................................................................ 19-8相關(guān)應(yīng)用筆記 ................................................................................................................................................. 19-9版本歷史 ...................................................................................................................................................... 19-10第20 章比較器 20-1簡介 ............................................................................................................................................................... 20-2控制寄存器 .................................................................................................................................................... 20-3設(shè)置比較器模式 ............................................................................................................................................. 20-4比較器工作原理 ............................................................................................................................................. 20-6比較器參考源 ................................................................................................................................................. 20-6比較器的響應(yīng)時(shí)間 ......................................................................................................................................... 20-8比較器輸出 .................................................................................................................................................... 20-8比較器中斷 .................................................................................................................................................... 20-9休眠狀態(tài)下比較器的操作 ............................................................................................................................... 20-9復(fù)位的影響 .................................................................................................................................................... 20-9模擬輸入連接方式注意事項(xiàng) .......................................................................................................................... 20-10初始化 ......................................................................................................................................................... 20-11設(shè)計(jì)技巧 ...................................................................................................................................................... 20-12相關(guān)應(yīng)用筆記 ............................................................................................................................................... 20-13版本歷史 ...................................................................................................................................................... 20-14第21 章 8 位A/D 轉(zhuǎn)換器 21-1簡介 ............................................................................................................................................................... 21-2控制寄存器 .................................................................................................................................................... 21-3操作 ............................................................................................................................................................... 21-5A/D 采集時(shí)間要求 .......................................................................................................................................... 21-6A/D 轉(zhuǎn)換時(shí)鐘的選擇 ...................................................................................................................................... 21-8配置模擬輸入端口 ......................................................................................................................................... 21-9A/D 轉(zhuǎn)換 ...................................................................................................................................................... 21-10休眠期間的A/D 轉(zhuǎn)換 ................................................................................................................................... 21-12A/D 精度/ 誤差 ............................................................................................................................................ 21-13復(fù)位對A/D 轉(zhuǎn)換的影響 ................................................................................................................................ 21-13CCP 觸發(fā)器的使用 ...................................................................................................................................... 21-14連接注意事項(xiàng) ............................................................................................................................................... 21-14傳遞函數(shù) ...................................................................................................................................................... 21-14初始化 ......................................................................................................................................................... 21-15設(shè)計(jì)技巧 ...................................................................................................................................................... 21-16相關(guān)應(yīng)用筆記 ............................................................................................................................................... 21-17版本歷史 ...................................................................................................................................................... 21-18第22 章基本型8 位A/D 轉(zhuǎn)換器 22-1簡介 ............................................................................................................................................................... 22-2控制寄存器 .................................................................................................................................................... 22-3A/D 采集時(shí)間要求 .......................................................................................................................................... 22-6A/D 轉(zhuǎn)換時(shí)鐘的選擇 ...................................................................................................................................... 22-8配置模擬輸入端口 ....................................................................................................................................... 22-10A/D 轉(zhuǎn)換 ...................................................................................................................................................... 22-11休眠期間的A/D 轉(zhuǎn)換 ................................................................................................................................... 22-14A/D 轉(zhuǎn)換精度/ 誤差 ..................................................................................................................................... 22-15復(fù)位對A/D 轉(zhuǎn)換的影響 ................................................................................................................................ 22-16連接時(shí)的考慮事項(xiàng) ....................................................................................................................................... 22-16傳遞函數(shù) ...................................................................................................................................................... 22-16初始化 ......................................................................................................................................................... 22-17設(shè)計(jì)技巧 ...................................................................................................................................................... 22-18相關(guān)應(yīng)用筆記 ............................................................................................................................................... 22-19版本歷史 ...................................................................................................................................................... 22-20第23 章 10 位A/D 轉(zhuǎn)換器 23-1簡介 ............................................................................................................................................................... 23-2控制寄存器 .................................................................................................................................................... 23-3操作 ............................................................................................................................................................... 23-5A/D 采集時(shí)間要求 .......................................................................................................................................... 23-6A/D 轉(zhuǎn)換時(shí)鐘的選擇 ...................................................................................................................................... 23-8模擬輸入引腳的設(shè)置 ...................................................................................................................................... 23-9A/D 轉(zhuǎn)換的編程舉例 .................................................................................................................................... 23-10休眠期間的A/D 轉(zhuǎn)換 ................................................................................................................................... 23-14復(fù)位對A/D 轉(zhuǎn)換的影響 ................................................................................................................................ 23-14A/D 轉(zhuǎn)換精度與誤差 .................................................................................................................................... 23-15連接時(shí)的考慮事項(xiàng) ....................................................................................................................................... 23-16傳遞函數(shù) ...................................................................................................................................................... 23-16初始化 ......................................................................................................................................................... 23-17設(shè)計(jì)技巧 ...................................................................................................................................................... 23-18相關(guān)應(yīng)用筆記 ............................................................................................................................................... 23-19版本歷史 ...................................................................................................................................................... 23-20第24 章積分型A/D 轉(zhuǎn)換器 24-1簡介 ............................................................................................................................................................... 24-2控制寄存器 .................................................................................................................................................... 24-3轉(zhuǎn)換過程 ........................................................................................................................................................ 24-6其它模擬模塊 ............................................................................................................................................... 24-12校準(zhǔn)參數(shù) ...................................................................................................................................................... 24-13設(shè)計(jì)技巧 ...................................................................................................................................................... 24-14相關(guān)應(yīng)用筆記 ............................................................................................................................................... 24-15版本歷史 ...................................................................................................................................................... 24-16第25 章 LCD 25-1簡介 ............................................................................................................................................................... 25-2控制寄存器 .................................................................................................................................................... 25-3LCD 定時(shí) ....................................................................................................................................................... 25-6LCD 中斷 ..................................................................................................................................................... 25-12像素控制 ...................................................................................................................................................... 25-13電壓發(fā)生器 .................................................................................................................................................. 25-15休眠模式下的操作 ....................................................................................................................................... 25-16復(fù)位的影響 .................................................................................................................................................. 25-17LCD 模塊的設(shè)置 .......................................................................................................................................... 25-17判別比 ......................................................................................................................................................... 25-18LCD 電壓發(fā)生器 .......................................................................................................................................... 25-20對比度 ......................................................................................................................................................... 25-22LCD 玻璃基板 .............................................................................................................................................. 25-22初始化 ......................................................................................................................................................... 25-23設(shè)計(jì)技巧 ...................................................................................................................................................... 25-24相關(guān)應(yīng)用筆記 ............................................................................................................................................... 25-25版本歷史 ...................................................................................................................................................... 25-26第26 章看門狗定時(shí)器與休眠模式 26-1簡介 ............................................................................................................................................................... 26-2控制寄存器 .................................................................................................................................................... 26-3看門狗定時(shí)器（WDT）的操作 ....................................................................................................................... 26-4休眠省電模式 ................................................................................................................................................. 26-7初始化 ........................................................................................................................................................... 26-9設(shè)計(jì)技巧 ...................................................................................................................................................... 26-10相關(guān)應(yīng)用筆記 ............................................................................................................................................... 26-11版本歷史 ...................................................................................................................................................... 26-12第27 章器件配置位 27-1簡介 ............................................................................................................................................................... 27-2配置字位 ........................................................................................................................................................ 27-4編程校驗(yàn)/ 代碼保護(hù) ....................................................................................................................................... 27-8識別碼ID 的位置 ........................................................................................................................................... 27-9設(shè)計(jì)技巧 ...................................................................................................................................................... 27-10相關(guān)應(yīng)用筆記 ............................................................................................................................................... 27-11版本歷史 ...................................................................................................................................................... 27-12第28 章在線串行編程 28-1簡介 ............................................................................................................................................................... 28-2進(jìn)入在線串行編程模式 .................................................................................................................................. 28-3應(yīng)用電路 ........................................................................................................................................................ 28-4編程器 ........................................................................................................................................................... 28-6編程環(huán)境 ........................................................................................................................................................ 28-6其它優(yōu)點(diǎn) ........................................................................................................................................................ 28-7PICmicro® OTP 型單片機(jī)的現(xiàn)場編程 ............................................................................................................. 28-8FLASH 型 PICmicro® 單片機(jī)的現(xiàn)場編程 ...................................................................................................... 28-10設(shè)計(jì)技巧 ...................................................................................................................................................... 28-12相關(guān)應(yīng)用筆記 ............................................................................................................................................... 28-13版本歷史 ...................................................................................................................................................... 28-14第29 章指令集 29-1簡介 ............................................................................................................................................................... 29-2指令格式 ........................................................................................................................................................ 29-4作為源/ 目標(biāo)寄存器的特殊功能寄存器 ........................................................................................................... 29-6Q 周期操作 .................................................................................................................................................... 29-7指令描述 ........................................................................................................................................................ 29-8設(shè)計(jì)技巧 ...................................................................................................................................................... 29-45相關(guān)應(yīng)用筆記 ............................................................................................................................................... 29-47版本歷史 ...................................................................................................................................................... 29-48第30 章電氣規(guī)范 30-1簡介 ............................................................................................................................................................... 30-2絕對最大值 .................................................................................................................................................... 30-3器件選型表 .................................................................................................................................................... 30-4器件電壓規(guī)范 ................................................................................................................................................. 30-5器件電流特性 ................................................................................................................................................. 30-6輸入閾值電平 ................................................................................................................................................. 30-9I/O 電流特性 ................................................................................................................................................ 30-10輸出驅(qū)動電壓 ............................................................................................................................................... 30-11I/O 引腳的容性負(fù)載 ..................................................................................................................................... 30-12數(shù)據(jù)EEPROM / 閃存 .................................................................................................................................. 30-13LCD ............................................................................................................................................................. 30-14比較器和參考電壓 ....................................................................................................................................... 30-15時(shí)序參數(shù)符號 ............................................................................................................................................... 30-16外部時(shí)鐘時(shí)序波形圖和時(shí)序要求示例 ............................................................................................................ 30-17上電和復(fù)位時(shí)序波形圖及要求示例 ............................................................................................................... 30-19定時(shí)器Timer0 和Timer1 時(shí)序波形圖及要求示例 ......................................................................................... 30-20CCP 的時(shí)序圖及要求 ................................................................................................................................... 30-21并行從動端口 (PSP) 時(shí)序圖及要求 .............................................................................................................. 30-22SSP 和 MSSP SPITM 模式時(shí)序波形圖及要求示例 ....................................................................................... 30-23SSP I2CTM 模式時(shí)序波形圖及要求示例 ........................................................................................................ 30-27MSSP I2CTM 模式時(shí)序波形圖及要求示例 ..................................................................................................... 30-30USART/SCI 時(shí)序波形圖及要求示例 ............................................................................................................. 30-328 位 A/D 時(shí)序波形圖及要求示例 ................................................................................................................... 30-3410 位A/D 時(shí)序波形圖及要求示例 ................................................................................................................. 30-36積分型A/D 時(shí)序波形圖及要求示例 ............................................................................................................... 30-38LCD 時(shí)序波形圖及要求示例 ......................................................................................................................... 30-40相關(guān)應(yīng)用筆記 ............................................................................................................................................... 30-41版本歷史 ...................................................................................................................................................... 30-42第31 章器件特性 31-1簡介 ............................................................................................................................................................... 31-2特性和電氣規(guī)范 ............................................................................................................................................. 31-2DC 和AC 特性圖表 ....................................................................................................................................... 31-2版本歷史 ...................................................................................................................................................... 31-22第32 章開發(fā)工具 32-1簡介 ............................................................................................................................................................... 32-2集成開發(fā)環(huán)境（IDE） ................................................................................................................................... 32-3MPLAB® 軟件語言支持 ................................................................................................................................. 32-6MPLAB® SIM 軟件模擬器 ............................................................................................................................... 32-8MPLAB® 硬件仿真器支持 ............................................................................................................................... 32-9MPLAB® 編程器支持 ................................................................................................................................... 32-10輔助工具 ...................................................................................................................................................... 32-11開發(fā)板 ......................................................................................................................................................... 32-12針對其它Microchip 產(chǎn)品的開發(fā)工具 ............................................................................................................ 32-14相關(guān)應(yīng)用筆記 ............................................................................................................................................... 32-15版本歷史 ...................................................................................................................................................... 32-16第33 章代碼開發(fā) 33-1版本歷史 ........................................................................................................................................................ 33-2第34 章附錄 34-1I2CTM 概述...................................................................................................................................................... 34-2LCD 玻璃基板生產(chǎn)商.................................................................................................................................... 34-11改進(jìn)的器件特性............................................................................................................................................ 34-13版本歷史....................................................................................................................................................... 34-19第35 章術(shù)語表 35-1版本歷史 ...................................................................................................................................................... 35-14目錄

標(biāo)簽： PIC 單片機(jī)

上傳時(shí)間： 2013-11-15

上傳用戶：nanshan
MCS-51指令表

MCS-51指令表.chm

標(biāo)簽： MCS 51 指令表

上傳時(shí)間： 2013-10-20

上傳用戶：alex wang
基于FPGA數(shù)字電壓表的設(shè)計(jì)報(bào)告

基于FPGA數(shù)字電壓表的設(shè)計(jì) 　　EDA是電子設(shè)計(jì)自動化（Electronic Design Automation）的縮寫，在20世紀(jì)60年代中期從計(jì)算機(jī)輔助設(shè)計(jì)（CAD）、計(jì)算機(jī)輔助制造（CAM）、計(jì)算機(jī)輔助測試（CAT）和計(jì)算機(jī)輔助工程（CAE）的概念發(fā)展而來的。 EDA技術(shù)就是以計(jì)算機(jī)為工具，設(shè)計(jì)者在EDA軟件平臺上，用硬件描述語言VHDL完成設(shè)計(jì)文件，然后由計(jì)算機(jī)自動地完成邏輯編譯、化簡、分割、綜合、優(yōu)化、布局、布線和仿真，直至對于特定目標(biāo)芯片的適配編譯、邏輯映射和編程下載等工作。本電壓表的電路設(shè)計(jì)正是用VHDL語言完成的。此次設(shè)計(jì)采用的是Altera公司的Quartus II 7.0軟件。本次設(shè)計(jì)的參考電壓為2.5V，精度為0.01V。此電壓表的設(shè)計(jì)特點(diǎn)為通過軟件編程下載到硬件實(shí)現(xiàn)，設(shè)計(jì)周期短，開發(fā)效率高。

標(biāo)簽： FPGA 數(shù)字電壓表報(bào)告

上傳時(shí)間： 2013-11-24

上傳用戶：無聊來刷下
容遲網(wǎng)絡(luò)中基于復(fù)制策略的單播路由算法研究

容遲/容延網(wǎng)絡(luò)（Delay Tolerant Network/DTN）泛指由于節(jié)點(diǎn)移動、能量管理、調(diào)度等原因而出現(xiàn)頻繁中斷、甚至長時(shí)間處于中斷狀態(tài)的一類網(wǎng)絡(luò)。針對DTN具有的時(shí)延高、割裂頻繁、節(jié)點(diǎn)能量受限、以及節(jié)點(diǎn)移動性等特點(diǎn)，通過對DTN中基于復(fù)制策略的單播路由策略進(jìn)行分類和比較，提出了如何優(yōu)化DTN單播路由算法、提高網(wǎng)絡(luò)傳輸率的建議。

標(biāo)簽： 容遲網(wǎng)絡(luò) 策略路由算法研究

上傳時(shí)間： 2013-11-24

上傳用戶：xiaojie
Si4432在無線抄表設(shè)備上的應(yīng)用

Si4432在無線抄表設(shè)備上的應(yīng)用

標(biāo)簽： 4432 Si 無線抄表設(shè)備

上傳時(shí)間： 2013-10-31

上傳用戶：onewq
GPRS無線抄表終端

GPRS無線抄表終端

標(biāo)簽： GPRS 無線抄表

上傳時(shí)間： 2013-11-15

上傳用戶：金宜
自動抄表的低功耗無線網(wǎng)絡(luò)設(shè)計(jì)與實(shí)現(xiàn)

由于近些年來智能電網(wǎng)的大力發(fā)展需求出現(xiàn)了各種自動抄表系統(tǒng)的應(yīng)用方案，但各有不足之處未能真正在我國廣泛采用。為了實(shí)現(xiàn)智能電網(wǎng)自動抄表系統(tǒng)的真正應(yīng)用，設(shè)計(jì)了一種易于實(shí)現(xiàn)的、網(wǎng)絡(luò)開銷小并低功耗的無線網(wǎng)絡(luò)，它采用ARM和MCU作為自動抄表系統(tǒng)的無線集中器硬件平臺，并搭配Sub-GHz的射頻收發(fā)模塊，集中器與節(jié)點(diǎn)設(shè)備之間采用自定義協(xié)議的自動組網(wǎng)形式，可實(shí)現(xiàn)50個(gè)節(jié)點(diǎn)自動靈活組網(wǎng)，而且網(wǎng)絡(luò)開銷小只占用4 k存儲空間。整個(gè)系統(tǒng)具有實(shí)用性和應(yīng)用性強(qiáng)的特點(diǎn)。

標(biāo)簽： 自動抄表低功耗無線網(wǎng)絡(luò)設(shè)計(jì)

上傳時(shí)間： 2013-10-17

上傳用戶：fqscfqj