MOV	R0,#HIGH
	INC	R0		; In case of HIGH=0, R0 must be 1
;                               to go out from the loop immediately !
	MOV	R1,#LOW
	INC	R1		; Same as up

DLY:	NOP

	DJNZ	R1,DLY
	DJNZ	R0,DLY