<button id="ewwsm"></button> 適用于51單片機的串口發n
上傳時間： 2014-12-25
上傳用戶：qingzhuhu
89c51一種用N+1條線實現矩陣鍵盤
標簽： 矩陣鍵盤
上傳時間： 2014-12-26
上傳用戶：lhw888
HIGH SPEED 8051 μC CORE - Pipe-lined Instruction Architecture; Executes 70% of Instructions in 1 or 2 System Clocks - Up to 25MIPS Throughput with 25MHz System Clock - 22 Vectored Interrupt Sources MEMORY - 4352 Bytes Internal Data RAM (256 + 4k) - 64k Bytes In-System Programmable FLASH Program Memory - External Parallel Data Memory Interface – up to 5Mbytes/sec DIGITAL PERIPHERALS - 64 Port I/O; All are 5V tolerant - Hardware SMBusTM (I2CTM Compatible), SPITM, and Two UART Serial Ports Available Concurrently - Programmable 16-bit Counter/Timer Array with 5 Capture/Compare Modules - 5 General Purpose 16-bit Counter/Timers - Dedicated Watch-Dog Timer; Bi-directional Reset CLOCK SOURCES - Internal Programmable Oscillator: 2-to-16MHz - External Oscillator: Crystal, RC, C, or Clock - Real-Time Clock Mode using Timer 3 or PCA SUPPLY VOLTAGE ........................ 2.7V to 3.6V - Typical Operating Current: 10mA @ 25MHz - Multiple Power Saving Sleep and Shutdown Modes 100-Pin TQFP (64-Pin Version Available) Temperature Range: –40°C to +85°C
標簽： C8051F020
上傳時間： 2013-10-12
上傳用戶：lalalal
常用主板I/O芯片簡介
上傳時間： 2013-11-10
上傳用戶：yupw24
〔摘要〕介紹了幾種通過單片機1/O口鍵盤擴展的方法。主要探討了幾種采用較少的1/O口實現較多按鍵的方法?！碴P鍵詞〕單片機;1/O口;鍵盤擴展
上傳時間： 2013-10-31
上傳用戶：jkhjkh1982
PIC 單片機的組成習題解答 解答部分1. PIC 單片機指令的執行過程遵循著一種全新哈佛總線體系結構的原則，充分利用了計算機系統在程序存儲器和數據存儲器之間地址空間的相互獨立性，取指過程和執行指令過程可以流水線操作同時進行。因此，當PIC 時鐘頻率為4MHZ時，執行一條非轉移類指令需要4 個系統時鐘周期，即1us,但其指令執行的真實時間應為2us(在執行n—1 條指令時取第n 條指令，然后執行第n 條指令)。所以選項B 正確2. 端口RE 共有3 個引腳RE0~RE2，它們除了用做普通I/O 引腳和第5~7 路模擬信號輸入引腳外，還依次分別承擔并行口讀出/寫入/片選控制端引腳。A． 對。讀出/寫入（REO~RE1）。B．錯。同步串行的相關引腳與端口C 有關。C．錯。通用異步/同步串行的相關引腳與端口C有關。D． 錯。CCP模塊的相關引腳也是與端口C有關。所以選項A正確。3. 上電延時電路能提供一個固定的72ms 上電延時，從而使VDD有足夠的時間上繁榮昌盛到單片機合適的工作電壓。所以選項B 正確。
上傳時間： 2013-11-09
上傳用戶：glxcl
各系列I/O型單片機使用手冊 第一部份 單片機概論 1第一章 硬件結構 3簡介3特性4技術特性4內核特性4周邊特性5選擇表6系統框線圖7引腳分配8引腳說明10極限參數15直流電氣特性16交流電氣特性18EEPROM 交流電氣特性18系統結構圖19時序和流水線結構(Pipelining) 19程序計數器21堆棧23算術及邏輯單元 – ALU24MTP 程序存儲器25結構25特殊向量26查表27查表程序范例28在線燒寫30數據存儲器31結構31通用數據存儲器32專用數據存儲器32
上傳時間： 2013-10-15
上傳用戶：yimoney
I/O 型單片機使用手冊 目錄 間接尋址寄存器 – IAR, IAR0, IAR1 .............................................35間接尋址指針 – MP, MP0, MP1 ......................................................35存儲區指針 – BP .........................................................................36累加器 – ACC...................................................................................37程序計數器低字節寄存器 – PCL....................................................37表格寄存器 – TBLP,TBHP,TBLH....................................................37看門狗定時寄存器 – WDTS............................................................38狀態寄存器 – STATUS.....................................................................38中斷控制寄存器 – INTC,INTC0,INTC1 .........................................39定時/計數寄存器...............................................................................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....................................................................................45定時/計數器..............................................................................................46配置定時/計數器輸入時鐘源...........................................................47定時/計數寄存器 – TMR, TMR0,TMR0L/TMR0H,TMR1L/TMR1H,TMR2.....................................................................49定時/計數控制寄存器 – TMRC,TMR0C,TMR1C,TMR2C............50定時器模式........................................................................................53事件計數器模式................................................................................53脈沖寬度測量模式............................................................................54可編程分頻器(PFD)和蜂鳴器的應用..............................................55預分頻器(Prescaler)...........................................................................56輸入/輸出接口...................................................................................56編程注意事項....................................................................................57定時/計數器應用范例.......................................................................57中斷............................................................................................................59中斷寄存器........................................................................................59中斷優先權........................................................................................62外部中斷............................................................................................63定時/計數器中斷...............................................................................64UART 中斷........................................................................................64編程注意事項....................................................................................65復位和初始化............................................................................................66復位....................................................................................................66目錄iii異步串行口——UART............................................................................74UART 特性..........................................................................................74UART 外部引腳..................................................................................74數據發送.............................................................................................75UART 狀態控制寄存器......................................................................75波特率發生器.....................................................................................79UART 設置與控制..............................................................................81UART 發送器......................................................................................83UART 接收器......................................................................................84接收錯誤處理.....................................................................................85接收中斷圖解.....................................................................................86地址檢測模式.....................................................................................86暫停模式下的UART 功能.................................................................87UART 應用范例.................................................................................87振蕩器........................................................................................................89系統時鐘配置....................................................................................89系統晶體/陶瓷振蕩器.......................................................................89系統電阻電容振蕩器........................................................................90內部系統電阻電容振蕩器................................................................90RTC 振蕩器........................................................................................91看門狗定時振蕩器............................................................................91暫停和喚醒................................................................................................92暫停.....................................................................................................92進入暫停.............................................................................................92靜態電流.............................................................................................92喚醒....................................................................................................92看門狗定時器............................................................................................94掩膜選項....................................................................................................96應用電路....................................................................................................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數據的傳送......................................................................................101算術運算..........................................................................................102邏輯和移位運算..............................................................................102分支和控制的轉換..........................................................................102位運算..............................................................................................102查表運算..........................................................................................103其它運算..........................................................................................103指令設定一覽表......................................................................................104慣例..................................................................................................104I/O 型單片機使用手冊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..................................................................................................121語句語法..................................................................................................122名稱..................................................................................................122操作項..............................................................................................122操作數項..........................................................................................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數據定義偽指令..............................................................................130宏指令..............................................................................................132匯編語言指令..........................................................................................136名稱..................................................................................................136助記符..............................................................................................136操作數、運算子和表達式..............................................................136其它..........................................................................................................139前置引用..........................................................................................139局部標號..........................................................................................139匯編語言保留字..............................................................................140編譯器選項..............................................................................................141編譯列表文件格式..................................................................................141源程序列表......................................................................................141編譯總結..........................................................................................142其它..................................................................................................142第三部份 開發工具................................................................... 145第五章 單片機開發工具.........................................................................147HT-IDE 集成開發環境............................................................................147盛群單片機仿真器(HT-ICE) ..................................................................149HT-ICE 接口卡.................................................................................149OTP 燒寫器.....................................................................................149OTP 適配卡.....................................................................................149系統配置..................................................................................................150HT-ICE 接口卡設置........................................................................151安裝..........................................................................................................153系統要求..........................................................................................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：建立一個新項目..............................................................159步驟二：將源程序文件加到項目中..............................................159步驟三：編譯項目..........................................................................159步驟四：燒寫OTP 單片機.............................................................160步驟五：傳送程序與掩膜選項單至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初學者工具使用手冊 MTP(可多次燒寫)使用者工具是一個認識HOLTEK 8 位微控制器的快捷便利、低成本途徑。它也可以作為MTP 編程器和驗證板。
上傳時間： 2013-10-08
上傳用戶：xiaodu1124
linux 中斷和設備驅動 本章介紹L i n u x內核是如何維護它支持的文件系統中的文件的，我們先介紹 V F S ( Vi r t u a lFile System，虛擬文件系統)，再解釋一下L i n u x內核的真實文件系統是如何得到支持的。L i n u x的一個最重要特點就是它支持許多不同的文件系統。這使 L i n u x非常靈活，能夠與許多其他的操作系統共存。在寫這本書的時候， L i n u x共支持1 5種文件系統： 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。無疑隨著時間的推移，L i n u x支持的文件系統數還會增加。
上傳時間： 2013-11-13
上傳用戶：zxh122
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