使用GM 8123高速串口扩展芯片扩展核心微处理器串口，实现多模块控制。
Additionally, the serial port of MPU are extended by GM8123 to realize multi-module control.
采用89c51单片机，串口扩展芯片8251、中断扩展芯片8259等器件设计了一种指令格式转换器。
A dictate converter has been designed by using chip computer 89c51, serial extended chip 8251, interrupted extended chip 8259, and so on.
硬件设计着重介绍了利用单片机、M22手机模块和串口扩展芯片GM 8125搭建的嵌入式短消息处理器。
Hardware desiring emphasized how to construct an embedded short message server used single chip computer, M22 module, and serial port extend chip GM8125.
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