也谈MCS-51单片机的P3端口

Another Discussion About Port 3 in MCS-51 Single Chip Microcomputer too

Port3是 MCS-51单片机的一个特殊接口,它具有双重功能,应用很广.本文对 Port3接口的双重功能的切换逻辑进行了分析,并针对一种分析观点,提出了自己的看法.

Port 3,which has doubled function and has been used wildly,is a special port of MCS-51 single chip microcomputer.In this paper the change logic of the doubled function of port 3 is analyzed and author's view is put forward in the light of a kind of analysis.