單片機(jī)畢業(yè)設(shè)計(jì)(論文)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)
2025-01-19 07:59本頁(yè)面
【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。早期的單片機(jī)都是8位或4位的?？慷阅懿诲e(cuò)獲得了很大的好評(píng)?；谶@一系統(tǒng)的單片機(jī)系統(tǒng)直到現(xiàn)在還在廣泛使用。隨著工業(yè)控制領(lǐng)域要求的提。代后隨著消費(fèi)電子產(chǎn)品大發(fā)展，單片機(jī)技術(shù)得到了巨大提高。位，并且進(jìn)入主流市場(chǎng)。目前，高端的32位單片機(jī)主頻已經(jīng)超過(guò)300MHz，性能。實(shí)上單片機(jī)是世界上數(shù)量最多的計(jì)算機(jī)?，F(xiàn)代人類生活中所用的幾乎每件電子和機(jī)。至比人類的數(shù)量還要多?；蚪Y(jié)果控制單片機(jī)的運(yùn)行。時(shí)存儲(chǔ)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。即為8051的工作周期，是最小的時(shí)間單位。在這128B的內(nèi)存中，有32byteses，被稱作工作寄存器，和常用的微處理器。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。是8位精確的雙向口，共占了32針。式8051-P3口作為單片機(jī)的P1口?？梢岳酶淖冸娮璧妮敵龃笮?，直接地充當(dāng)
【正文】 use. Expand among the system of memory outside having slice, P2 mouth see high 8 address off。 P0 mouth is a twoway bus, send the introduction of 8 low addresses and data / export in timesharing Output grade , P3 of mouth , P1 of P1 , connect with inside have load resistance of drawing , every one of they can drive 4 Model LS TTL load to output. As while inputting the mouth, any TTL or NMOS circuit can drive P1 of 8051 onechip puters as P3 mouth in a normal way . Because draw resistance on output grade of them have, can open a way collector too or drainsource resistance is it urge to open a way, do not need to have the resistance of drawing outerly . Mouths 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 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.
環(huán)評(píng)公示相關(guān)推薦
鄂ICP備17016276號(hào)-1