52单片机不用定时中断如何实现60S秒表功能

#include sbit AA=P0^7;//数码管显示用IO端口 sbit BB=P0^6; sbit CC=P0^5; sbit DD=P0^4; sbit K1=P3^2; sbit K2=P3^5; sbit K3=P3^7; int s,m; char table[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,}; void YS(int x); //延迟函数声明 void XS(in