求单片机实验的外部中断实验的程序

#include<reg51.h>

#include<intrins.h>

#define uchar unsigned char

uchar cnt,times

void delay()

{

uchar i

TMOD=0x01

TH0=(65536-50000)/256

TL0=(65536-50000)%256

TR0=1

for(i=0i<timesi++)

{

while(TF0==0)

TH0=(65536-50000)/256

TL0=(65536-50000)%256

TF0=0

}

TR0=0

}

void ext0() interrupt 0

{

uchar i,j

P1=0xfe

times=8

for(i=0i<5i++)

{

for(j=0j<8j++)

{

P1=_crol_(P1,1)

delay()

}

}

}

void ext1() interrupt 2

{

uchar i,j

P1=0x7f

times=12

for(i=0i<3i++)

{

for(j=0j<8j++)

{

P1=_cror_(P1,1)

delay()

}

}

}

main()

{

EX0=1

EX1=1

IT0=0

IT1=1

PX0=0

PX1=1

while(1)

}

中断

#include <REGX52.H>

sbit PWM=P2^0

void InitTimer1(void)

{

TMOD = 0x10

TH1 = 0x0FC

TL1 = 0x18

EA = 1

ET1 = 1

TR1 = 0

EX1=1

IT1=1

}

void main(void)

{

InitTimer1()

while(1)

}

void Timer1Key(void) interrupt 2

{

TR1=~TR1

}

void Timer1Interrupt(void) interrupt 3

{

TH1 = 0x0FC

TL1 = 0x18

PWM=~PWM

}

查询

#include <REGX52.H>

sbit PWM=P2^0

sbit key=P3^3

void InitTimer1(void)

{

TMOD = 0x10

TH1 = 0x0FC

TL1 = 0x18

EA = 1

ET1 = 1

TR1 = 0

}

void main(void)

{

InitTimer1()

while(1)

if(key==0)TR1 = 1

}

void Timer1Interrupt(void) interrupt 3

{

TH1 = 0x0FC

TL1 = 0x18

PWM=~PWM

}

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