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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Program instruction set, logic stack and data type of I/O memory which are tied up with tasks in the soft-PLC system are analyzed and studied.

研究了系统的程序指令集、逻辑堆栈和I/O存储器数据类型，实验表明系统具有良好的实时性和可靠性。

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Cease not, o my son, to hear instruction, and be not ignorant of the words of knowledge.

我儿，你停止听取教训，就是远离智慧的训言。

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