【正文】 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(jié)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(guān)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。 When resistance value is very large, P1 mouth, in order to hinder the introduction state high. Output as P1 mouth high electricity at ordinary times, can is it draw electric current load to offer outwards, draw the resistance on needn39。clock, can output W line signal . At the time of programming, it is that the first function is still the second function but needn39。s head and monitor the pin with the oscillograph tentatively, push and is restored to the throne the key, the wave form that observes and has enough range is exported (instantaneous), can also through is it restore to the throne circuit group holding value carry on the experiment to change. 。t mistake, in order to extricate oneself from a predicament , need to be pressed and restored to the throne the key restarting too. It is an input end which is restored to the throne the signal in 8051 China RST pin. Restore to the throne signal high level effective , should sustain 24 shake cycle (namely 2 machine cycles ) the above its effective times. If 6 of frequency of utilization brilliant to shake, restore to the throne signal duration should exceed 4 delicate to finish restoring to the throne and operating. Produce the logic picture of circuit which is restored to the throne the signal: Restore to the throne the circuit and include two parts outside in the chip entirely. Outside that circuit produce to restore to the throne signal (RST ) hand over to Schmitt39。clock, output Q end signal。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 regarded as the transfer station of data transmission on 8051 inside . The same as general microprocessor, it is the busiest register. Help remembering that agreeing with A expresses in the order. The controller includes the procedure counter , the order is depositted, the order decipher, the oscillator and timing circuit, etc. The procedure counter is made up of counter of 8 for two, amounts to 16. It is a byte address counter of the procedure in fact, the content is the next IA that will carried out in PC. The content which changes it can change the direction that the procedure carries out . Shake the circuit in 8051 onechip puters, only need outer quartz crystal and frequency to finely tune the electric capacity, its frequency range is its 12MHZ of . This pulse signal, as 8051 basic beats o