51系列單片機中英文翻譯資料-資料下載頁
2024-11-03 05:34本頁面
【導讀】列之后,于1980年8引入一個計算機芯片監(jiān)控監(jiān),于1976年48系列.。一類型很多行一個芯片的電腦芯片都如8051、8031、8751、80c51bh,80c31bh等,電腦晶片有一個芯片的計算機系統(tǒng)是由以下幾個方面:18微處理器.其中,CPU的核心是一個電腦芯片,它是計算機和指揮控制中心等部分組成,時運作往往是來自一店經營者,這是經營下去,使計暫時經營成果和行政協調會.此外,行政協調會經常被視為轉運站,在8051年的數據傳輸.一般微處理器一樣,.這一脈沖信號,作為8051年工作的基本節(jié)拍,即單位時間內的最低.儲存數據和資料等無人。在這種羊128b,有32個單位字節(jié)可以出任就業(yè)登記,這。是與一般不同的微處理器、8051切片和就業(yè)登記成立一個級別相同的地點安排.系統(tǒng),這四個港口可準確雙向口一/O共同使用。求其門南轅北轍相處.不同于其他P0口口,其產量即將年級抵抗.。到相應的門閂頭也使操作結束。相對約20,000ohms因負載阻力,因為在現場。生產W.節(jié)目時,它是第一個功能,但仍是第二個功能不用軟件P3口提前成立.
【正文】 that the first function is still the second function but needn39。t have software that set up P3 mouth in advance . It hardware not inside is the automatic to have two function outputted when CPU carries on SFR and seeks the location (the location or the byte ) to visit to P3 mouth /at not lasting lining, there are inside hardware latch Qs = operation principle of P3 mouth is similar to P1 mouth. 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.
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