TLC2543是TI公司的12位串行模數(shù)轉(zhuǎn)換器，使用開關(guān)電容逐次逼近技術(shù)完成A/D轉(zhuǎn)換過程。由于是串行輸入結(jié)構(gòu)，能夠節(jié)省51系列單片機(jī)I/O資源；且價(jià)格適中，分辨率較高，因此在儀器儀表中有較為廣泛的應(yīng)用。 TLC2543的特點(diǎn) （1）12位分辯率A/D轉(zhuǎn)換器； （2）在工作溫度范圍內(nèi)10μs轉(zhuǎn)換時(shí)間； （3）11個(gè)模擬輸入通道； （4）3路內(nèi)置自測(cè)試方式； （5）采樣率為66kbps； （6）線性誤差±1LSBmax； （7）有轉(zhuǎn)換結(jié)束輸出EOC； （8）具有單、雙極性輸出； （9）可編程的MSB或LSB前導(dǎo)； （10）可編程輸出數(shù)據(jù)長度。 TLC2543的引腳排列及說明 TLC2543有兩種封裝形式：DB、DW或N封裝以及FN封裝，這兩種封裝的引腳排列如圖1，引腳說明見表1 TLC2543電路圖和程序欣賞 #include<reg52.h> #include<intrins.h> #define uchar unsigned char #define uint unsigned int sbit clock=P1^0; sbit d_in=P1^1; sbit d_out=P1^2; sbit _cs=P1^3; uchar a1,b1,c1,d1; float sum,sum1; double sum_final1; double sum_final; uchar duan[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; uchar wei[]={0xf7,0xfb,0xfd,0xfe}; void delay(unsigned char b) //50us { unsigned char a; for(;b>0;b--) for(a=22;a>0;a--); } void display(uchar a,uchar b,uchar c,uchar d) { P0=duan[a]|0x80; P2=wei[0]; delay(5); P2=0xff; P0=duan[b]; P2=wei[1]; delay(5); P2=0xff; P0=duan[c]; P2=wei[2]; delay(5); P2=0xff; P0=duan[d]; P2=wei[3]; delay(5); P2=0xff; } uint read(uchar port) { uchar i,al=0,ah=0; unsigned long ad; clock=0; _cs=0; port<<=4; for(i=0;i<4;i++) { d_in=port&0x80; clock=1; clock=0; port<<=1; } d_in=0; for(i=0;i<8;i++) { clock=1; clock=0; } _cs=1; delay(5); _cs=0; for(i=0;i<4;i++) { clock=1; ah<<=1; if(d_out)ah|=0x01; clock=0; } for(i=0;i<8;i++) { clock=1; al<<=1; if(d_out) al|=0x01; clock=0; } _cs=1; ad=(uint)ah; ad<<=8; ad|=al; return(ad); } void main() { uchar j; sum=0;sum1=0; sum_final=0; sum_final1=0; while(1) { for(j=0;j<128;j++) { sum1+=read(1); display(a1,b1,c1,d1); } sum=sum1/128; sum1=0; sum_final1=(sum/4095)*5; sum_final=sum_final1*1000; a1=(int)sum_final/1000; b1=(int)sum_final%1000/100; c1=(int)sum_final%1000%100/10; d1=(int)sum_final%10; display(a1,b1,c1,d1); } }
上傳時(shí)間： 2013-11-19
上傳用戶：shen1230
MG3500SoC是支持H.264高清編解碼器的片上系統(tǒng)，內(nèi)部集成一個(gè)嵌入式ARM926處理器，支持高清H.264編解碼、MPEG鄄2解碼和JPEG編解碼。介紹了MG3500SoC的主要性能特點(diǎn)、引腳排列、主要接口功能及在DVR上的應(yīng)用，以及MG3500SoC及其周圍器件的硬件設(shè)計(jì)，提出了在設(shè)計(jì)中應(yīng)注意的問題。 Abstract: The MG3500System-on-Chip（SoC）is high definition（HD）H.264codec,including ARM926-EJ processor，H.264encoder/decoder，MPEG2decoder and JPEG/MJPEG encoder/decoder.The features,pin assignments，interfaces and the typical application of MG3500in DVR are introduced in this paper.The application hardware circuit between the MG3500SoC and peripheral device are given,the questions which the syetem design needs to pay attention are explained.
上傳時(shí)間： 2013-11-12
上傳用戶：elinuxzj
常用主板I/O芯片簡介
上傳時(shí)間： 2013-11-10
上傳用戶：yupw24
〔摘要〕介紹了幾種通過單片機(jī)1/O口鍵盤擴(kuò)展的方法。主要探討了幾種采用較少的1/O口實(shí)現(xiàn)較多按鍵的方法。〔關(guān)鍵詞〕單片機(jī);1/O口;鍵盤擴(kuò)展
標(biāo)簽： 單片機(jī) 鍵盤 擴(kuò)展方法
上傳時(shí)間： 2013-10-31
上傳用戶：jkhjkh1982
各系列I/O型單片機(jī)使用手冊(cè) 第一部份 單片機(jī)概論 1第一章 硬件結(jié)構(gòu) 3簡介3特性4技術(shù)特性4內(nèi)核特性4周邊特性5選擇表6系統(tǒng)框線圖7引腳分配8引腳說明10極限參數(shù)15直流電氣特性16交流電氣特性18EEPROM 交流電氣特性18系統(tǒng)結(jié)構(gòu)圖19時(shí)序和流水線結(jié)構(gòu)(Pipelining) 19程序計(jì)數(shù)器21堆棧23算術(shù)及邏輯單元 – ALU24MTP 程序存儲(chǔ)器25結(jié)構(gòu)25特殊向量26查表27查表程序范例28在線燒寫30數(shù)據(jù)存儲(chǔ)器31結(jié)構(gòu)31通用數(shù)據(jù)存儲(chǔ)器32專用數(shù)據(jù)存儲(chǔ)器32
上傳時(shí)間： 2013-10-15
上傳用戶：yimoney
SIMATIC H系統(tǒng)介紹 在現(xiàn)代工業(yè)的各個(gè)領(lǐng)域，要求擁有一種能夠滿足經(jīng)濟(jì)、環(huán)保、節(jié)能的高度自動(dòng)化系統(tǒng)，同時(shí)，具有冗余及故障安全功能的可編程控制器是針對(duì)最高等級(jí)的控制需求。 H(高可靠性)系統(tǒng)，通過將發(fā)生中斷的單元自動(dòng)切換到備用單元的方法實(shí)現(xiàn)系統(tǒng)的不中斷工作，H系統(tǒng)通過部件的冗余實(shí)現(xiàn)系統(tǒng)的高可靠性。 F（故障安全）系統(tǒng)，通過將發(fā)生中斷的系統(tǒng)切換到安全狀態(tài)（通常為停車）來避免造成對(duì)生命、環(huán)境和原材料的破壞。 FH或HF(故障安全和高可靠性)系統(tǒng),通過將發(fā)生故障的通道關(guān)閉，保證系統(tǒng)無擾動(dòng)運(yùn)行。 S7-400H是西門子提供的最新冗余PLC.由于他是SIMATIC S7家族的一員,這意味S7-400H擁有所有SIMATIC S7具有的先進(jìn)性。
標(biāo)簽： SIMATIC
上傳時(shí)間： 2013-10-14
上傳用戶：18862121743
I/O 型單片機(jī)使用手冊(cè) 目錄 間接尋址寄存器 – IAR, IAR0, IAR1 .............................................35間接尋址指針 – MP, MP0, MP1 ......................................................35存儲(chǔ)區(qū)指針 – BP .........................................................................36累加器 – ACC...................................................................................37程序計(jì)數(shù)器低字節(jié)寄存器 – PCL....................................................37表格寄存器 – TBLP,TBHP,TBLH....................................................37看門狗定時(shí)寄存器 – WDTS............................................................38狀態(tài)寄存器 – STATUS.....................................................................38中斷控制寄存器 – INTC,INTC0,INTC1 .........................................39定時(shí)/計(jì)數(shù)寄存器...............................................................................39輸入/輸出端口和控制寄存器...........................................................40UART 寄存器 .USR,UCR1,UCR2,TXR/RXR,BRG.......................40輸入/輸出端口..........................................................................................41上拉電阻............................................................................................41PA 口的喚醒......................................................................................41輸入/輸出端口控制寄存器...............................................................41引腳共享功能....................................................................................42編程注意事項(xiàng)....................................................................................45定時(shí)/計(jì)數(shù)器..............................................................................................46配置定時(shí)/計(jì)數(shù)器輸入時(shí)鐘源...........................................................47定時(shí)/計(jì)數(shù)寄存器 – TMR, TMR0,TMR0L/TMR0H,TMR1L/TMR1H,TMR2.....................................................................49定時(shí)/計(jì)數(shù)控制寄存器 – TMRC,TMR0C,TMR1C,TMR2C............50定時(shí)器模式........................................................................................53事件計(jì)數(shù)器模式................................................................................53脈沖寬度測(cè)量模式............................................................................54可編程分頻器(PFD)和蜂鳴器的應(yīng)用..............................................55預(yù)分頻器(Prescaler)...........................................................................56輸入/輸出接口...................................................................................56編程注意事項(xiàng)....................................................................................57定時(shí)/計(jì)數(shù)器應(yīng)用范例.......................................................................57中斷............................................................................................................59中斷寄存器........................................................................................59中斷優(yōu)先權(quán)........................................................................................62外部中斷............................................................................................63定時(shí)/計(jì)數(shù)器中斷...............................................................................64UART 中斷........................................................................................64編程注意事項(xiàng)....................................................................................65復(fù)位和初始化............................................................................................66復(fù)位....................................................................................................66目錄iii異步串行口——UART............................................................................74UART 特性..........................................................................................74UART 外部引腳..................................................................................74數(shù)據(jù)發(fā)送.............................................................................................75UART 狀態(tài)控制寄存器......................................................................75波特率發(fā)生器.....................................................................................79UART 設(shè)置與控制..............................................................................81UART 發(fā)送器......................................................................................83UART 接收器......................................................................................84接收錯(cuò)誤處理.....................................................................................85接收中斷圖解.....................................................................................86地址檢測(cè)模式.....................................................................................86暫停模式下的UART 功能.................................................................87UART 應(yīng)用范例.................................................................................87振蕩器........................................................................................................89系統(tǒng)時(shí)鐘配置....................................................................................89系統(tǒng)晶體/陶瓷振蕩器.......................................................................89系統(tǒng)電阻電容振蕩器........................................................................90內(nèi)部系統(tǒng)電阻電容振蕩器................................................................90RTC 振蕩器........................................................................................91看門狗定時(shí)振蕩器............................................................................91暫停和喚醒................................................................................................92暫停.....................................................................................................92進(jìn)入暫停.............................................................................................92靜態(tài)電流.............................................................................................92喚醒....................................................................................................92看門狗定時(shí)器............................................................................................94掩膜選項(xiàng)....................................................................................................96應(yīng)用電路....................................................................................................97第二部份 程序語言.....................................................................99第二章 指令集介紹.................................................................................101指令集......................................................................................................101指令周期..........................................................................................101數(shù)據(jù)的傳送......................................................................................101算術(shù)運(yùn)算..........................................................................................102邏輯和移位運(yùn)算..............................................................................102分支和控制的轉(zhuǎn)換..........................................................................102位運(yùn)算..............................................................................................102查表運(yùn)算..........................................................................................103其它運(yùn)算..........................................................................................103指令設(shè)定一覽表......................................................................................104慣例..................................................................................................104I/O 型單片機(jī)使用手冊(cè)iv第三章 指令定義.....................................................................................107第四章 匯編語言和編譯器.....................................................................121常用符號(hào)..................................................................................................121語句語法..................................................................................................122名稱..................................................................................................122操作項(xiàng)..............................................................................................122操作數(shù)項(xiàng)..........................................................................................122注解..................................................................................................122編譯偽指令..............................................................................................123條件編譯偽指令..............................................................................123文件控制偽指令..............................................................................124程序偽指令......................................................................................126數(shù)據(jù)定義偽指令..............................................................................130宏指令..............................................................................................132匯編語言指令..........................................................................................136名稱..................................................................................................136助記符..............................................................................................136操作數(shù)、運(yùn)算子和表達(dá)式..............................................................136其它..........................................................................................................139前置引用..........................................................................................139局部標(biāo)號(hào)..........................................................................................139匯編語言保留字..............................................................................140編譯器選項(xiàng)..............................................................................................141編譯列表文件格式..................................................................................141源程序列表......................................................................................141編譯總結(jié)..........................................................................................142其它..................................................................................................142第三部份 開發(fā)工具................................................................... 145第五章 單片機(jī)開發(fā)工具.........................................................................147HT-IDE 集成開發(fā)環(huán)境............................................................................147盛群單片機(jī)仿真器(HT-ICE) ..................................................................149HT-ICE 接口卡.................................................................................149OTP 燒寫器.....................................................................................149OTP 適配卡.....................................................................................149系統(tǒng)配置..................................................................................................150HT-ICE 接口卡設(shè)置........................................................................151安裝..........................................................................................................153系統(tǒng)要求..........................................................................................153硬件安裝..........................................................................................153軟件安裝..........................................................................................154目錄v第六章 快速開始.....................................................................................159步驟一：建立一個(gè)新項(xiàng)目..............................................................159步驟二：將源程序文件加到項(xiàng)目中..............................................159步驟三：編譯項(xiàng)目..........................................................................159步驟四：燒寫OTP 單片機(jī).............................................................160步驟五：傳送程序與掩膜選項(xiàng)單至Holtek ..................................160附錄............................................................................................... 161附錄A 特性曲線圖...................................................................................163附錄B 封裝信息.......................................................................................173
上傳時(shí)間： 2013-10-18
上傳用戶：blacklee
HOLTEK I/O 8-Bit MTP輸入/輸出型八位可多次編程單片機(jī)初學(xué)者工具使用手冊(cè) MTP(可多次燒寫)使用者工具是一個(gè)認(rèn)識(shí)HOLTEK 8 位微控制器的快捷便利、低成本途徑。它也可以作為MTP 編程器和驗(yàn)證板。
上傳時(shí)間： 2013-10-08
上傳用戶：xiaodu1124
Keil C51開發(fā)系統(tǒng)基本知識(shí)3 1. 1. 專用寄存器include文件例如8031、8051均為REG51.h其中包括了所有8051的SFR及其位定義，一般系統(tǒng)都必須包括本文件。2. 2. 絕對(duì)地址include文件absacc.h該文件中實(shí)際只定義了幾個(gè)宏，以確定各存儲(chǔ)空間的絕對(duì)地址。3. 3. 動(dòng)態(tài)內(nèi)存分配函數(shù)，位于stdlib.h中 4. 4. 緩沖區(qū)處理函數(shù)位于“string.h”中其中包括拷貝比較移動(dòng)等函數(shù)如：memccpy memchr memcmp memcpy memmove memset這樣很方便地對(duì)緩沖區(qū)進(jìn)行處理。5. 5. 輸入輸出流函數(shù)，位于“stdio.h”中流函數(shù)通8051的串口或用戶定義的I/O口讀寫數(shù)據(jù)，缺省為8051串口，如要修改，比如改為LCD顯示，可修改lib目錄中的getkey.c及putchar.c源文件，然后在庫中替換它們即可。3. 第三節(jié) Keil C51庫函數(shù)原型列表
標(biāo)簽： Keil C51 開發(fā)系統(tǒng) 基本知識(shí)
上傳時(shí)間： 2013-11-06
上傳用戶：smallfish
linux 中斷和設(shè)備驅(qū)動(dòng) 本章介紹L i n u x內(nèi)核是如何維護(hù)它支持的文件系統(tǒng)中的文件的，我們先介紹 V F S ( Vi r t u a lFile System，虛擬文件系統(tǒng))，再解釋一下L i n u x內(nèi)核的真實(shí)文件系統(tǒng)是如何得到支持的。L i n u x的一個(gè)最重要特點(diǎn)就是它支持許多不同的文件系統(tǒng)。這使 L i n u x非常靈活，能夠與許多其他的操作系統(tǒng)共存。在寫這本書的時(shí)候， L i n u x共支持1 5種文件系統(tǒng)： e x t、 e x t 2、x i a、 m i n i x、 u m s d o s、 msdos 、v f a t、 p r o c、 s m b、 n c p、 i s o 9 6 6 0、 s y s v、 h p f s、 a ffs 和u f s。無疑隨著時(shí)間的推移，L i n u x支持的文件系統(tǒng)數(shù)還會(huì)增加。
標(biāo)簽： linux 中斷 設(shè)備驅(qū)動(dòng)
上傳時(shí)間： 2013-11-13
上傳用戶：zxh122
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