CAJ | 학술논문

分析了 MCS51单片机访问外部存储器指令 MOVX 的执行过程，介绍了51系列单片机使用的四要素；分析了51单片机在外部扩展、总线时序、地址译码方法重点以及对超过64 KB 地址空间访问的方法。并以实验室研制的 MCS51单片机实验仪为例，分析了外部空间开展的重要性、方法和原理，给出了单片机系统扩展框图和地址译码表。
분석료 MCS51단편궤방문외부존저기지령 MOVX 적집행과정，개소료51계렬단편궤사용적사요소；분석료51단편궤재외부확전、총선시서、지지역마방법중점이급대초과64 KB 지지공간방문적방법。병이실험실연제적 MCS51단편궤실험의위례，분석료외부공간개전적중요성、방법화원리，급출료단편궤계통확전광도화지지역마표。
This paper analyzes the process of the command "MOVX" that MCS51 accesses its external memory , and introduces the four key elements of the serial of 51 MCU: external expansion of 51MCU , bus sequence , the method of address decoding and the method of accessing address space which beyond 64 KB . Case in MCS51 developed in laboratory , the paper analyzes the im-portance , method and principle of expanding external space , and shows the block diagram of system expansion of MCU and the character of the address decoding .