四、程序清单
#include<reg51.h> sbit s2=P3^4; sbit rs=P3^5; sbit lcden=P3^4; sbit dula=P2^6; sbit wela=P2^7;
#define uchar unsigned char #define uint unsigned int #define uint unsigned int #define uchar unsigned char
sbit adrd=P3^7; sbit adwr=P3^6; sbit diola=P2^5; sbit dula=P2^6; sbit wela=P2^7;
unsigned char j,k,adval;
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