- #include "reg51.h"
- unsigned char code tab[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
- unsigned char dat[4];
- sbit clock=P1^4;
- sbit start=P1^5;
- sbit eoc=P1^6;
- sbit oe=P1^7;
- void delay(unsigned int s){
- unsigned char i;
- while(s--)for(i=0;i<200;i++);
- }
- void display(unsigned char a)
- {
- unsigned char c=0x01,i;
- dat[3]=tab[a%10];dat[2]=tab[a%100/10];
- dat[1]=tab[a/100];dat[0]=tab[a/1000];
- for(i=0;i<4;i++){
- P1=0xe0|c;
- P0=dat[i];
- c=c<<1;
- delay(2);
- }
- return;
-
- }
- initial(){
- TMOD=0x10;
- TH1=0xff;
- TL1=0x9C;
- ET1=1;
- EA=1;
- TR1=1;
- }
- void main()
- {
- initial();
- while(1){
- start=0;
- start=1;
- start=0;
- while(!eoc);
- oe=1;
- display(P2);
- oe=0;
- }
- }
- t0_int() interrupt 3
- {
- TH1=0xff;
- TL1=0x9C;
- clock=!clock;
- }
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