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10秒秒表首次按键计时开始，再次按键暂停，第三次按键清零。电路如图：程序如下：#include<reg51.h>#define uchar unsigned char#define uint unsigned intsbit K1=P3^7;uchar i,Second_Counts,Key_Flag_Idx;bit Key_State;uchar DSY_CODE[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

#include<reg51.h>#include<intrins.h>#define uchar unsigned char#define uint unsigned int//延时void DelayMS(uint x){uchar i;while(x–){for(i=0;i<120;i++);}}//主程序void main(){uchar i;P2=0x01;while(1){for(i=0;i<7;i++){P2=cr