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)-文庫吧資料
2025-01-27 07:59本頁面
【正文】 tion. It is not very the same that the memory of MCS51 series onechip puter and general puter disposes the way in addition. General puter for first address space, ROM and RAM can arrange in different space within the range of this address at will, namely the addresses of ROM and RAM, with distributing different address space in a formation. While visiting the memory, corresponding and only an address Memory unit, can ROM, it can be RAM too, and by visiting the order similarly. This kind of memory structure is called the structure of Princeton. 8051 memories are divided into procedure memory space and data memory space on the physics structure, there are four memory spaces in all: The procedure stores in one and data memory space outside data memory and one in procedure memory space and one outside one, the structure forms of this kind of procedure device and data memory separated form data memory, called Harvard structure. But use the angle from users, 8051 memory address space is divided into three kinds: (1) In the slice, arrange blocks of FFFFH , 0000H of location , in unison outside the slice (use 16 addresses). (2) The data memory 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. 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 dedicated processor, while the average model prices fall to one . dollars, the most highend [1] model only 10 SCM systems are no longer only in the development and use of bare metal environment, a large number of proprietary embedded operating system is widely used in the full range of SCM. The handheld puters and cell phones as the core processing of highend microcontroller can even use a dedicated Windows and Linux operating systems. More than a dedicated MCU processor suitable for embedded systems, so it was up to the application. In fact the number of SCM is the world39。檢查和檢測其發(fā)出信號，用示波器顯示時，結(jié)合復(fù)位電路很重要，觀察波形時， 輸出口（瞬時）的波動范圍是很大的，也可以通過復(fù)位電路對實(shí)驗(yàn)進(jìn)行有必要的改變。雖然復(fù)位電路的結(jié)構(gòu)很簡單，但它的功能是非常重要的。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)位信號輸出電路，并把信號傳送到每個引腳，按順序到了復(fù)位引腳，就會迅速響應(yīng)信號指令。如果收到高頻的 6v 輸入信號，單片機(jī)就會復(fù)位。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誤，也要能夠解決錯誤，重新運(yùn)行。比如 8051 單片機(jī)，所有端口提供的輸出電流只能幾毫安，用作輸出口時接一個普通的晶體管，要穩(wěn)定使用，還要接一定電
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