MCS-48单片微计算机具有直接的 I/O 接口能力和中断处理功能。其70%左右的指令是单字节指令,执行指令周期短、速度快,能进行一定的运算处理,因之常用来作为精密电子称的控制核心。用单片微电脑作为测试控制单元,其接口电路的设计有不少特殊之处,本文介绍了医用和商用电子称微电脑电路的设计原理。 MCS-48 single-chip microcomputer with direct I / O interface capabilities and interrupt handling capabilities. About 70% of its instructions are single-byte instructions, the implementation of the instruction cycle is short, fast, able to carry out a certain amount of computing, which is often used as a precision electronic weighing control core. Microcontroller with a single chip as a test control unit, the interface circuit design has many special features, this article describes the design of medical and commercial electronic microcomputer circuit design.