ad0808 转换程序以及原理图

ADC转换程序显示U5.000V/*/ADC模数转换电压表 /作者：张武林 /时间：2012/08/11 /*/*/调用库、宏定义端口 /*/#include #include #define uint unsigned int #define uchar unsigned char#define DATA P0#define ADC P1/sbit CLOCK=P30;sbit START=P30;sbit OE=P31; /*/ /*/定义变量和数组 /*/uchar dispcount,adc;int Uo,ge,shi,bai,qian,s;uchar code Dispduan=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00; uchar Dispwei=0,0,0,0,0,0;/*/*/延时子程序 /*/void delay(uint z) uint x,y; for(x=100;x0;x-) for(y=z;y0;y-) ; /*/*/中断初始化 /*/void intrrupt_init() EA=1; TR0=1; ET0=1; TMOD=0x01; TH0=0xf0; TL0=0x60; dispcount=0; EOC=1; /*/*/写入数码管位码子程序 /*/void wei_to_disp() Dispwei0=16; Dispwei1=16; Dispwei2=qian; Dispwei3=bai; Dispwei4=shi; Dispwei5=ge;/*/*/读adc数据子程序 /*/void read_adc_tomcu() START=0;delay(1);START=1; /启动addelay(1); OE=1; /转换完读取数据delay(1);adc=ADC;OE=0;delay(1); /*/*/转换显示子程序 /*/void adc_zhuanhuan() Uo=100*adc; Uo=Uo/255; Uo=Uo*50; qian=Uo/1000; bai=Uo/100%10; shi=Uo/10%10; ge =Uo%10;/*/*/主程序 /*/void main() intrrupt_init(); while(1) read_adc_tomcu(); adc_zhuanhuan(); wei_to_disp();/*/*/定时器0子程序 /*/void time0() interrupt 1 TH0=0xf0;TL0=0x60;dispcount+;if(dispcount=6) dispcount=0; switch(dispcount) case 0:P2=0xfe;DATA=0x3e;break; case 1:P2=0xfd;DATA=0x40;break; case 2:P2=0xfb;DATA=DispduanDispweidispcount;DATA|=0X80;break; case 3:P2=0xf7;DATA=DispduanDispweidispcount;break; case 4:P2=0xef;DATA=DispduanDispwe