单片机仿真 定时器2-00-99计数器.rar

#include <reg52.h> typedef unsigned char uchar; typedef unsigned int uint; uchar Count,Sec,shift,n; uchar code LEDData[ ] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92, 0x82,0xF8,0x80,0x90,0xff}; uchar data display[2]; /******************************************************** 主函数 *********************************************************/ main() { P0 = 0xff; //端口初始化 P2 = 0xff; Count = 0x00; Sec = 0x00; n = 0x00; shift = 0xfe; //送位码初值 TMOD = 0x01; TH0 = 0x4c; //50ms定时 TL0 = 0x00; ET0 = 1; T2CON = 0x00; //设置T2CON寄存器 TH2 = 0xf8; //2ms定时 TL2 = 0xcc; ET2 = 1; //启用Timer2中断 EA = 1; //总中断允许 TR2 = 1; //启动定时器2 TR0 = 1; //启动定时器0 while(1) ; } /********************************************************* Timer0中断函数 （负责定时） **********************************************************/ void Timer0() interrupt 1 { TH0 = 0x4c; //50ms定时 TL0 = 0x00; ++Count; //中断计数单元加1 if(Count == 20) //50ms×20＝1s { Count = 0; //清中断计数单元 ++Sec; //秒单元加1 if(Sec == 100) Sec = 0; //清秒单元 } } /********************************************************* Timer2中断函数 （负责数码管显示） **********************************************************/ void timer2() interrupt 5 { TR2 = 0; TF2 = 0; //手工清中断标志 TH2 = 0xf8; //2ms定时常数 TL2 = 0xcc; if(n >= 2) //两位数码管显示 { n = 0; shift = 0x7f; //送位码初值 P2 = 0xff; //关闭显示 } else { display[0] = Sec%10; //个位 display[1] = Sec/10; //十位 P0 = LEDData[display[n++]]; //送段码 P2 = shift; //送位码 shift = (shift>>1)|0x80; //调整位码 } TR2 = 1; } /**********************************************************/