單片機(jī)外文翻譯----51系列單片機(jī)的結(jié)構(gòu)和功能-單片機(jī)-全文預(yù)覽
【正文】 emory address space outside one of 64KB, the address is arranged from 0000H 64KB FFFFH (with 16 addresses ) too to the location. (3) Data memory address space of 256B (use 8 addresses). Three abovementioned memory space addresses overlap, for distinguishing and designing the order symbol of different data transmission in the instruction system of 8051: CPU visit slice, ROM order spend MOVC , visit block RAM order uses MOVX outside the slice, RAM order uses MOV to visit in slice. 5 8051 onechip puter have four 8 walk abreast I/O port, call P0, P1, P2 and P3. Each port is 8 accurate twoway mouths, accounts for 32 pins altogether. Every one I/O line can be used as introduction and exported independently. Each port includes a latch (namely special function register ), one exports the driver and a introduction buffer . Make data can latch when outputting, data can buffer when making introduction , but four function of passway these selfsame. Expand among the system of memory outside having slice, four port these may serve as accurate twoway mouth of I/O in mon use. Expand among the system of memory outside having slice, P2 mouth see high 8 address off。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。檢查和檢測(cè)其發(fā)出信號(hào)，用示波器顯示時(shí)，結(jié)合復(fù)位電路很重要， 觀察波形時(shí)，輸出口（瞬時(shí)）的波動(dòng)范圍是很大的，也可以通過復(fù)位電路對(duì)實(shí)驗(yàn)進(jìn)行有必要的改變。外部電路采用施密特觸發(fā)方式觸發(fā)了復(fù)位鍵（ RST），形成了復(fù)位信號(hào)輸出電路，并把信號(hào)傳送到每個(gè)引腳，按順序到了復(fù)位引腳，就會(huì)迅速響應(yīng)信號(hào)指令。除了正常進(jìn)入系統(tǒng)的初始化，由于操作失誤或操作過程錯(cuò)誤，也要能夠解決錯(cuò)誤，重新運(yùn)行。其中每個(gè)口都是標(biāo)準(zhǔn)的雙向口。接外部存儲(chǔ)擴(kuò)大它們的內(nèi)存時(shí)，這四個(gè)口就可作為雙向口常用的 I / O 口，這是， P2 口看到高 8 位地址， P0 口是一個(gè)公共兩用口，傳送輸出低 8 的地址和數(shù)據(jù)。每個(gè)端口是 8 位精確 的雙向口，共占了 32 針。（ 3） 256B 的數(shù)據(jù)存儲(chǔ)器（使用 8 個(gè)地址）的地址空間。這種內(nèi)存結(jié)構(gòu)是所謂的普林斯頓結(jié)構(gòu)。在這 12
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