PWM.rar_keil pwm_可调pwm

#include"reg52.h" unsigned char cycle; unsigned char on; sbit led=P2^7; sbit key1=P3^2; sbit key2=P3^3; unsigned char const lednum[]={0x28,0xEB,0x32,0xA2,0xE1,0xA4,0x24,0xEA,0x20,0xA0}; void delay(unsigned int cnt) { while(--cnt); } main() { int i; cycle=10; on=9; IT0=1; IT1=1; TMOD|=0x01; TH0=(65536-5000)/256; TL0=(65536-5000)%256; IE=0x87; TR0=1; while(1) { led=0; delay(5000); } } void timer0(void)interrupt 1 using 1 { static unsigned char count=0; P0=lednum[on]; TH0=(65536-5000)/256; TL0=(65536-5000)%256; if(count==on) P1=0xff; count++; if(count==cycle) { count=0; if(on!=0) P1=0x00; } } void int0(void)interrupt 0 using 1 { delay(5000); if(key1==0) if(on>1) on--; } void int1(void)interrupt 2 using 1 { delay(5000); if(key2==0) if(on<9) on++; }