8)可编程I/O接口电路综述

高职

第八章可编程I/O接口电路

智慧校园教务系统

中国基础教育资源库

1可编程I/O接口电路——8255一、8255的内部结构框图如图所示。hijiyi.com1，数据端口a、b和c

每个端口由8位数据输入锁存器(或缓冲器)和8位数据输出锁存器组成。 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