串行通讯中TTL和EAI电平转换的软实现

本文以80C52单片机与TPUP-AF打印机的串行通讯为例,详细介绍了一种不使用电平转换芯片实现TTL与EAI电平软转换的方法。

This paper took the serial communication between 80C52 one-chip computer and TP UP-AF printer as an example,and introduced the soft realization of the level conversion between TTL and EAI without using level conversion chip.