proteus+keil5单片机仿真实验-四位数码管计时电路

#include <reg51.h> unsigned char code Tab[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90}; unsigned char Dat[]={0,0,0,0}; int i ,t; unsigned char tmp; unsigned char second=0,min=0; void Delay() { unsigned char i; for(i=0;i<250;i++); } void main() { IT0=1; EX0=1; IT1=1; EX1=1; EA=1; ET0=1; TMOD=0x01; TH0=-50000/256; TL0=-50000%256; TR0=1; while(1) { tmp=0x01; for(i=0;i<4;i++) { P2=tmp; P0=Tab[Dat[i]]; tmp=tmp<<1; Delay(); } } } void intserv1 (void) interrupt 1 using 1 { TH0=-50000/256; TL0=-50000%256; t++; if(t==20) { t=0; second++; if(second>=60) { second=0; min++; if(min>=60) min=0; } Dat[0]=min/10; Dat[1]=min%10; Dat[2]=second/10; Dat[3]=second%10; } } void intersvr0 (void) interrupt 0 using 1 { min++; if(min>=60) min=0; } void intersvr1 (void) interrupt 2 using 1 { second++; if(second>=60) second=0; }