【正文】 P3 口的正常發(fā)展 . 由于產(chǎn)量等作出抵抗的人 ,也可以公開方式收藏或流失的根源就是反抗的方式 ,要求公開 ,不須具備抵抗繪畫 . 別人都準確雙向口也 . 當行為投入 ,要 寫出一首相應的港口與門閂 . 以 80c51 一個計算機芯片 ,只能提供港口毫安的電流電產(chǎn)出 ,它是生產(chǎn)口去要求一個普通的計算是將晶體管、接觸的阻力應該在港口及半導體基地 同時為了抑制高電力輸出 P1~P3 級是恢復王位是一個著手運作一個計算機芯片 . 其主要功能是將電腦變成 0000h 開始 ,使一個開始進行計算機芯片進行程序 0000h 單位 . 除了那些進入正常 initialized 系統(tǒng) ,因為它的程序操作失誤或操作失誤不多 ,為了擺脫困境 ,必須按國家和恢復王位 ,恢復太重要了 . 這是一項投入恢復王位 ,結束了在 8051 年中國信息表寄 . 恢復王位高有效信號 ,應保持 24 震撼周期 (機器周期 ,2)有效時間段 . 6 如果使用頻率前去輝煌 ,恢復王位信號完成期限不得超過 4 微妙的王位 ,恢復營業(yè) . 邏輯電路生產(chǎn)情況 ,恢復王位的信號 : 恢復王位的電路兩部分組成 ,包括外部的芯片完全 . 外界產(chǎn)生電路恢復王位信號(表 )交給史密特的啟動 ,恢復王位樣品電路產(chǎn)量 ,史密特觸發(fā)不斷每一 s5p機器周期有一次 ,光有與恢復王位和經(jīng)營所需 insidly 信號 . 恢復王位抵抗一般線路、電容參數(shù)適合 6精彩震撼 ,是否能恢復王位高信號機會大于 2 周期保證 . 正在恢復王位是簡單的電路 ,其作用 是非常重要的 . 張一電腦芯片系統(tǒng)可正常運作 ,應先檢查一下 ,才能恢復王位沒有成功 . 檢測可以流行頭和監(jiān)督寄與初步示波器 ,并把恢復王位的關鍵 ,波的形式 ,并認為有足夠的距離輸出 (瞬間 ),也就是通過它來恢復電路值進行實現(xiàn)改變。 Structure and function of the MCS51 series Structure and function of the MCS51 series onechip puter MCS51 is a name of a piece of onechip puter series which Intel Company produces. This pany introduced 8 topgrade onechip puters of MCS51 series in 1980 after introducing 8 onechip puters of MCS48 series in 1976. It belong to a lot of kinds this line of onechip puter the chips have,such as 8051, 8031, 8751, 80C51BH, 80C31BH,etc., their basic position, basic performance and instruction system are all the same. 8051 daily representatives 51 serial onechip puters . An onechip puter system is made up of several following parts: ( 1) One microprocessor of 8 (CPU). ( 2) At slice data memory RAM (128B/256B),it use not depositting not can reading /data that write, such as result not middle of operation, final result and data wanted to show, etc. ( 3) Procedure memory ROM/EPROM (4KB/8KB ), is used to preserve the procedure , some initial data and form in slice. But does not take ROM/EPROM within some onechip puters, such as 8031 , 8032, 80C ,etc.. ( 4) Four 8 run side by side I/O interface P0 four P3, each mouth can use as introduction , may use as exporting too. ( 5) Two timer / counter, each timer / counter may set up and count in the way, used to count to the external incident, can set up into a timing way too, and can according to count or result of timing realize the control of the puter. ( 6) Five cut off cutting off the control system of the source . ( 7) One all duplexing serial I/O mouth of UART (universal asynchronous receiver/transmitter (UART) ), is it realize onechip puter or onechip puter and serial munication of puter to use for. ( 8) Stretch oscillator and clock produce circuit, quartz crystal finely tune electric capacity need outer. Allow oscillation frequency as 12 megahertas now at most. Every the abovementioned part was joined through the inside data bus .Among them, CPU is a core of the onechip puter, it is the control of the puter and mand centre, made up of such parts as arithmetic unit and controller , etc.. The arithmetic unit can carry on 8 persons of arithmetic operation and unit ALU of logic operation while including one, the 1 storing device temporarilies of 8, storing device 2 temporarily, 839。s accumulation device ACC, register B and procedure state register PSW, etc. Person who accumulate ACC count by 2 input ends entered of checking etc. temporarily as one operation often, e from person who store 1 operation is it is it make operation to go on to count temporarily , operation result and loopback ACC with another one. In addition, ACC is often