ADC0804应用

#include

#define uint unsigned int

#define uchar unsigned char

sbit p20=P2^0;//数码管位选端定义

sbit p21=P2^1;//数码管位选端定义

sbit p22=P2^2;//数码管位选端定义

sbit cs=P2^4;

sbit rd=P2^5;

sbit wr=P2^6;

unsigned char code tab[] =

{

0XC0,//;0

0XF9,//;1

0XA4,//;2

0XB0,//;3

0X99,//;4

0X92,//;5

0X82,//;6

0XF8,//;7

0X80,//;8

0X90,//;9

};

void delay(uchar z)

{

uint i;

while(z--)

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

}

void disp(uchar a,uchar b,uchar c)

{

p20=1;

p21=0;

p22=0;

P0=tab[a];

delay(5);

P0=0xff;

p20=0;

p21=1;

p22=0;

P0=tab[b];

delay(5);

P0=0xff;

p20=0;

p21=0;

p22=1;

P0=tab[c];

delay(5);

P0=0xff;

}

void stdc()

{

cs=0;

wr=1;

wr=0;

wr=1;

}

void main()

{

uchar A,B,C,d;

while(1)

{

stdc();

delay(10);

rd=1;

delay(1);

rd=0;

d=P3;

rd=1;

A=d/100;

B=d%100/10;

C=d%10;

disp(A,B,C);

}

}