单片机程序清单说明书

#include

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sbit ALE = P3^3;

sbit OE = P3^4;

sbit EOC = P3^5;

sbit STA = P3^6;

sbit CLK = P3^7;

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unsigned int num; //AD转换后的数字量

char ch;

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void delay(unsigned int z) //延时函数

{

unsigned int x, y;

for(x = z; x > 0; x--) for(y = 110; y > 0; y--) CLK = ~CLK;

} //在延时函数中，给ADC0809送去CLK

//---------------------------------------------------

void display(void)

{

char code table[] = { //共阴段码

0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, //0~7

0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71}; //8~F

P0 = 0; P2 = 0xfb; P0 = table[num / 100]; delay(2);//百位加上小数点P0 = 0; P2 = 0xfd; P0 = table[num % 100 / 10]; delay(2);//十位

P0 = 0; P2 = 0xfe; P0 = table[num % 10]; delay(2);//个位

P0 = 0; //关闭显示器

}

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void main(void)

{

while(1) { //无穷循环

ch = P2 / 32;

P3 = ch + 0xf8; //送给ADC0809

ALE = 1; ALE = 0; //地址锁存

STA = 1; STA = 0; //开始转换，稍候，才可读EOC

display(); //显示，既做延时，又输出CLK

while(EOC == 0) display(); //等待转换结束

num = P1; //取出转换结果

num = num * 100 / 51; //比例变换：255 --> 500

}

}

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