单片机I/O的扩展 作者： 时间：2016-11-23 来源：网络 加入技术交流群 扫码加入和技术大咖面对面交流海量资料库查询 收藏 <a href='https://ad.eepw.com.cn/www/delivery/ck.php?n=a635e61e&cb=INSERT_RANDOM_NUMBER_HERE' target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a> <a href='https://ad.eepw.com.cn/www/delivery/ck.php?n=a576c0a2&cb=INSERT_RANDOM_NUMBER_HERE' target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a> 8255是微机并行可编程I/O口扩展芯片。本文引用地址：https://www.eepw.com.cn/article/201611/320390.htm程序如下：ORG0000HAJMPMAINORG0100HMAIN:MOVSP,#030HMOVP0,#00HMOVR0,#07BH;控制字地址MOVA,#083H;8255A初始设置MOVX@R0,AMOVR0,#007CH;A端口地址MOVA,#0FFHMOVX@R0,AMOVA,#0ffH;流水灯付初值
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