电压表程序

A/D

#include <reg51.h>

#define uchar unsigned char  

#define uint unsigned int

uchar code LEDData[]= {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,

0x7f,0x6f};

sbit  OE=P2^7;

sbit  EOC=P2^6;

sbit  START=P2^5;

sbit  CLK=P2^4;

sbit  ALE=P2^5;

void Delay(uint count)

{   

uchar i;

    while(count--)

for(i=0;i<120;i++);

}

void Display_Result(uchar num)   

{   

num=num*5/255;

P2 = 0xf7;    //FB=1111 0111

P0 = LEDData[num%10];

Delay(5);

P2 = 0xfb;  

P0 = LEDData[num%100/10];   

Delay(5);

P2 = 0xfd;   

P0 = LEDData[num/100];     

Delay(5);

}

void main(void)

{   

TMOD = 0x02;   

TH0 = 206;      

TL0 = 206;

TR0=1;      

EA=1;

ET0=1;   

ALE=0;

ALE=1;      

while(1)      

{   

START = 0;   

START= 1;   

START = 0;   

while(EOC==0);

OE = 1;     

Display_Result(P1);   

OE = 0;      

}

}

void Timer0_INT() interrupt 1

{   

CLK = !CLK;   

}

拜托，有原理图可好