外文資料翻譯---51系列單片機(jī)的結(jié)構(gòu)和功能-單片機(jī)-資料下載頁(yè)
【導(dǎo)讀】51系列單片機(jī)是英特爾公司生產(chǎn)的具有一定結(jié)構(gòu)和功能的單片機(jī)產(chǎn)品。它包含很多種這類型的單片機(jī)，如8051，8031，一個(gè)單片機(jī)的系統(tǒng)是由以下幾部分組成：一個(gè)8位CPU微處理器。靜態(tài)隨機(jī)存取存儲(chǔ)器，能夠儲(chǔ)存程序運(yùn)行過(guò)程中產(chǎn)生的數(shù)據(jù)。器ROM/EPROM中，用來(lái)保存程序和一些初始數(shù)據(jù)。單片機(jī)中不使用ROM/EPROM中，如8031，8032，80c系列等。設(shè)置成常用的定時(shí)方式，并可以根據(jù)計(jì)算或結(jié)果控制單片機(jī)的運(yùn)行。送器UART），用于實(shí)現(xiàn)單片機(jī)的串行通信。外部電源的石英晶體微調(diào)電路，允許接在12v的振蕩頻率上。器，和2個(gè)8位的累加器組成。此外，Acc往往被視為對(duì)8051內(nèi)的數(shù)據(jù)傳輸中轉(zhuǎn)站。有記憶功能并執(zhí)行命令。該脈沖信號(hào)，即為8051的工作周期，是最小的時(shí)間。在這128B的內(nèi)存中，有32byteses，被稱作工作。8051單片機(jī)有4個(gè)8并行的I/O端口，分別為P0，P1，P2和P3。序到了復(fù)位引腳，就會(huì)迅速響應(yīng)信號(hào)指令。檢查和檢測(cè)其發(fā)出信號(hào)，用示波器顯示時(shí)，也可以通過(guò)復(fù)位電路對(duì)實(shí)驗(yàn)進(jìn)行有必要的改變。
【正文】 are all accurate twoway mouths too. When the conduct is input, must write the corresponding port latch with 1 first . As to 80C51 onechip puter, port can only offer milliampere of output electric currents, is it output mouth go when urging one ordinary basing of transistor to regard as, should contact a resistance among the port and transistor base , in order to the electricity while restraining the high level from exporting P1~P3 Being restored to the throne is the operation of initializing of an onechip puter. Its main function is to turn PC into 0000H initially , make the onechip puter begin to hold the conduct 7 procedure from unit 0000H. Except that the ones that enter the system are initialized normally,as because procedure operate it make mistakes or operate there aren39。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。s trigger, restore to the throne circuit sample to output , Schmitt of trigger constantly in each S5P2 , machine of cycle in having one more , then just got and restored to the throne and operated the necessary signal insidly. Restore to the throne resistance of circuit generally, electric capacity parameter suitable for 6 brilliant to shake, can is it restore to the throne signal high level duration greater than 2 machine cycles to guarantee. Being restored to the throne in the circuit is simple, its function is very important. Pieces of onechip puter system could normal running,should first check it can restore to the throne not succeeding. Checking and can pop one39。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.
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