MSC-51与外部数据存储器的一般连接方法：外部数据存储器的高8位地址由P2口提供，低8位地址线接地址锁存器的输出端。外部RAM的读、写控制信号分别接MCS-51的 、 。外部RAM的片选信号可由P2口未用的地址线的剩余口线以线选方式或译码方式提供-MSC-51 with the external data memory of the general connection method: external data memory address high 8 provided by the P2 population, low 8-bit Address Address Line output latch. External RAM reading and writing control signals, respectively, then the MCS-51,. External RAM chip select signal may be the P2 I did not address the remainder of the line to line I-line or decoding method of election to provide