#include <reg52.h>

#define uchar unsigned char

sbit LED_RED = P2^;

sbit LED_GREEN = P2^;

sbit LED_BLUE = P2^;

//要显示的颜色值

uchar COLOR_RED = 0xff;

uchar COLOR_GREEN = 0xcc;

uchar COLOR_BLUE = 0x33;

uchar i = ;

//初始化定时器，用于控制PWM波

void Init_INT0(){

    TMOD = 0x02;//工作方式2，8位自动装置定时器

    TH0 = 0xf0;

    TL0 = TH0;

    ET0 = ;

    EA = ;

    TR0 = ;

}

void main(){

    Init_INT0();

    while();

}

void INT0_Resolve() interrupt {

    //i的值从0-255循环，当i到达255时，i++的结果为0

    i++;

    //红色LED的PWM波形

    if(i < COLOR_RED){

        LED_RED = ;

    }else{

        LED_RED = ;

    }

    //绿色LED的PWM波形

    if(i < COLOR_GREEN){

        LED_GREEN = ;

    }else{

        LED_GREEN = ;

    }

    //蓝色LED的PWM波形

    if(i < COLOR_BLUE){

        LED_BLUE = ;

    }else{

        LED_BLUE = ;

    }

}