Summarization about calculator circuits based on 4 bit embeded system is given, include block diagram and work principle, the instruction system, the structure of MCU core and the I/O.

对基于4位嵌入式微控制器的计算器电路进行了综述，包括功能框图与工作原理、指令系统、内核硬件结构以及系统与外界接口等。

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This test platform can accomplish the on line test to the circuits and components of some kind of special calculator central control circuit board.

该测试平台主要完成对某专用计算器中央控制电路板的电路、器件的在线测试。

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