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源程序:
#include<reg51.h> void delay(int x); #define SEG P2 void main() { int k; char TAB[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//共阴极 while(1) { for(k=9;k>=0;k--) { SEG=TAB[k]; delay(500); } } } void delay(int x) { int i,j; for(i=0;i<x;i++) for(j=0;j<600;j++); }