AD转换控制单片机的PWM占空比.doc.doc

#include <reg51.h>

#define uchar unsigned char

#define uint unsigned int

sbit CLK =P2^4;

sbit ST=P2^5;

sbit EOC=P2^6;

sbit OE=P2^7;

sbit PWM=P3^0;

}

void main()

{

uchar Val;

TMOD=0x02;//定时器 T0 工作于方式 2 自动重装 8 位计数器

TH0=0x9b;

TL0=0x00;

IE=0x82; //允许 T0 中断

TR0=1; //启动定时器

while(1)

if(Val==0) //PWM 输出占空比为 0

{

PWM=0;

Delay(0xff);

continue;}

if(Val==0xFF) // PWM 输出占空比为 100%

{

PWM=1;

Delay(0xff);

continue;