基于 51 单片机的数字频率计 主要是Word格式的 2.1 系统硬件的构成4 2.2 系统工作原理图4 2.3AT89C51 单片机及其引脚说明 5 2.4 信号调理及放大整形模块7 2.5 时基信号产生电路7 2.6 显示模块

本文主要讲了3AT89C51单片机引脚说明及引脚图，希望对你的学习有所帮助。