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8031单片机的P_2口一般用于输出高位地址线,因此,那些不用作地址线而闲置的某些端口位也不能再作为静态I/O口用。本文介绍一种将其用作静态输出口的方法,并给出对此功能进行仿真调试的方法。
The P21 port of 8031 one-chip computer is generally used for outputting the high address line, therefore, some ports that are not used for the address line idle can no longer be used as the static I / O port. This article describes a way to use it as a static output port and gives a way to simulate this function.