#include "reg52.h"
#include<intrins.h>
sbit beep=P1^5;
void del(void)
{
#pragma asm
del3:mov r5,#100
del2:mov r6,#100
del1:mov r7,#25
del0:nop
nop
djnz r7,del0
djnz r6,del1
djnz r5,del2
#pragma endasm
}
void main()
{
while(1)
{
beep=~beep;
del(void);
}
}
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