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)-預(yù)覽頁
【正文】 內(nèi)部數(shù)據(jù)存儲(chǔ)空間和外部數(shù)據(jù)存儲(chǔ)空間。上述三個(gè)重疊的內(nèi)存空間地址，用 8051 指令系統(tǒng)的傳輸不同的數(shù)據(jù)和使用的功能區(qū)分。每一個(gè) I / O 線可作為獨(dú)立的入口和出口。 P3 口的輸出級(jí)別小于 P1，可以在里面繪制負(fù)載電阻，每一個(gè)都能驅(qū)動(dòng) 4 個(gè) LS型 TTL 負(fù)載輸出。當(dāng)在當(dāng)做輸入口時(shí)，必須把相應(yīng)的端口置 1 來鎖閉輸出。在 8051 中 RST 引腳是一個(gè)輸入復(fù)位鍵，復(fù)位鍵高電平信號(hào)有效，要保證 24 倍 以上的時(shí)鐘周期（即 2 個(gè)機(jī)器周期）。復(fù)位功能的可靠性，適合 6v 電壓的電容震蕩電路，復(fù)位信號(hào)的周期可以大于兩個(gè)機(jī)器周期。 附件 2：外文原文 Structure and function of the MCS51 series Structure and function of the MCS51 series onechip puter MCS51 is a name of a piece of onechip puter series which Intel Company produces. This pany introduced 8 topgrade onechip puters of MCS51 series in 1980 after introducing 8 onechip puters of MCS48 series in 1976. It belong to a lot of kinds this line of onechip puter the chips have,such as 8051, 8031, 8751, 80C51BH, 80C31BH,etc., their basic position, basic performance and instruction system are all the same. 8051 daily representatives 51 serial onechip puters . Early MCU 8bit or all of the four. One of the most successful is the INTEL 8031, because the performance of a simple and reliable access to a lot of good praise. Then developed in 8031 out of MCS51 MCU Systems. SCM systems based on this system until now is still widely used. With the increased requirements of industrial control field, began a 16bit microcontroller, because the cost is not satisfactory but have not been very widely used. After 90 years with the great development of consumer electronics, microcontroller technology has been a huge increase. With INTEL i960 series, especially the later series of widely used ARM, 32bit microcontroller quickly replace highend 16bit MCU status and enter the mainstream market. The traditional 8bit microcontroller performance have been the rapid increase capacity increase pared to 80 the number of times. Currently, highend 32bit microcontroller clocked over 300MHz, the performance catching the mid9039。 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 are
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