8051 Program – 1sec delay timer

; 1 second delay timer
	ORG 0H
	SJMP 30H

	ORG 0BH	; timer 0 isr
	SJMP ISR

	ORG 30H
	MOV A,#00
	MOV R0,#0
	MOV R1,#0
	MOV TMOD,#02H	;00000010-Run timer0 in mode 2
	MOV TH0,#118	;Set up timer 0 to overflow in 0.05msec
	MOV IE,#82H	;%10000010 – Enable timer0 interrupt
	SETB TCON.4	;Start the timer0HERE:SJMP HERE
HERE:	SJMP HERE
ISR:	CLR TCON.4	;Disable timer0
	INC R1	;r1*r2 = 100*200 = 20000 * 0.05msec = 1sec
	CJNE R1,#100,SKIP
	MOV R1,#00
	INC R0
	CJNE R0,#200,SKIP
	MOV R0,#00H
	INC A
SKIP:	SETB TCON.4	;Enable Timer
	RETI	;Return from interrupt subroutine
	END

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List of topics: 8051

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