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2.3 外部数据存储器当单片机需要外加RAM存储器时（扩展系统），必须使用专用的MOVX指令，此时单片机的端口功能就要发生相应的改变：① P0、P2作为外部RAM的地址和数据总线；② 使用MOVX指令进行读写操作。③ MOVX指令在执行时，会自动地产生/RD或/WR信号对外部RAM实现控制。指令通...

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一、单片机的结构原理1.1 主要性能和特点1.内部程序存储器ROM ：4K的flash程序存储器；2.寄存器区：4个寄存器区，每个区有R0-R7八个工作寄存器；3.8位并行输入输出端口：P0、P1、P2和P3；4.定时/计数器：2个16位的定时/计数器 T0、T1；5.串...

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更新时间 2024-02-04 10:06:28

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