/************************
*This is a simple 	*
*program to produce a 	*
*pulse using interrupts	*
************************/

USING 0
ORG 0
	JMP main
ORG 000BH
	CPL P1.0
	RETI
ORG 001BH
	JMP timer1ISR
ORG 0030H

main:	MOV TMOD, #12H
	MOV TH0, #06H
	MOV R7, #0C8H
	MOV R6, AR7
	SETB TF1
	SETB ET0
	SETB ET1
	SETB TR0
	SETB EA
	JMP $

timer1ISR:
	CLR TR1
	DJNZ R6, loop
	CPL P1.1
	MOV R6, AR7
loop:	MOV TH1, #3CH
	MOV TL1, #0B0H
	SETB TR1
	RETI

END