1.c

S2为功能键、S3为方式选择键 P1口为字符输出口,采用共阳显示管 P3.2~P3.5为位选,P1.7为报警发音,P3.7为被控继电器

#include <AT89X51.H>
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,
0x6d,0x7d,0x07,0x7f,0x6f};
unsigned char Second;

void delay1s(void)
{
unsigned char i,j,k;
for(k=100;k>0;k--)
for(i=20;i>0;i--)
for(j=248;j>0;j--);
}


void main(void)
{
Second=0;
P0=table(Second/10);
P2=table(Second%10);
while(1)
{
delay1s();
Second++;
if(Second==60)
{
Second=0;
}
P0=table(Second/10);
P2=table(Second%10);
}
}