用了51单片机的ID工作方式，使没有HOLD功能的51单片机能够直接通过片外RAM进行数据通信。不但硬件和软件的实现都比较简单，数据传输速度快，而且不涉及高成本特殊器件，实现“双核系统”。(With 51 MCU ID works, make no HOLD function of 51 single-chip microcomputer can directly through the external RAM data communication. Not only the realization of the hardware and software are relatively simple, data transmission speed, and does not involve the use of high cost of special devices, realize the \"dual system\".)