DecTest.txt

DECREMENT:
;	JNB p2.4 NOT_0 	;this chunk checks for the exception
;	JNB p0.5 NOT_0 	;where we would be going from -1 to 0
;	JNB p2.7 NOT_0	
;	JNB p0.6 NOT_0
;	JNB p0.4 NOT_0	;This port being 0 indicates negative
;	CLR p2.4
;	CLR p0.4
;NOT_0:
	JNB p2.4, D_L1ON
	CLR p2.4		;p2.4 = 0, light is on
	ACALL D_L2		;check light 2
D_L1ON:
	SETB p2.4
	ACALL DONE		;ACALL DOWN_SOUND		; Play a sound when exiting

D_L2:
	JNB p0.5, D_L2ON
	CLR p0.5		;p.05 = 0, light is on
	ACALL D_L3		;check light 3
D_L2ON:
	SETB p0.5
	ACALL DONE		;ACALL DOWN_SOUND		; Play a sound when exiting

D_L3:
	JNB p2.7, D_L3ON
	CLR p2.7		;p2.7 = 0, light is on
	ACALL D_L4		;check light 4
D_L3ON:
	SETB p2.7
	ACALL DONE		;ACALL DOWN_SOUND		; Play a sound when exiting

D_L4:
	JNB p0.6, D_L4ON
	CLR p0.6		;p0.6 = 0, light is on
	ACALL DONE		;ACALL DOWN_SOUND		; Play a sound when exiting
D_L4ON:
	SETB p0.6
	SETB p0.4		; Rollover always goes to 0
	ACALL DONE		; ACALL DOWN_SOUND		; Play a sound when exiting