;***********************************
;* BIT DEFINITIONS
;***********************************
	IB_M BIT P0.6			; EXTERNAL INTERRUPT PIN
;***********************************
; RESET
;***********************************
        ORG 0000H
        SJMP START
;***********************************
; KEYBOARD INTERRUPT VECTOR
;***********************************
        ORG 003BH
INT_KBI:
	MOV KBCON,#00H			; CLR KBIF TO PERMIT NEXT INT. KBCON ISNT BIT ADDRESABLE
	RETI
;***********************************
; STARTS HERE
;***********************************
START:
	MOV SP,#69H                	; STACK DEFINITION = 70H - 7FH
;***********************************
; KEYPAD CONFIGURATION
;***********************************
	MOV KBMASK,#040H		; MASK FOR P0.6 ONLY
	MOV KBPATN,#000H		; INTERRUPTS WHEN 0
        MOV KBCON,#002H		        ; INTERRUPTS WITH PATTERN MATCH, KBIF=0
        MOV IEN1,#02H			; ENABLES KEYPAD INT
        MOV IEN0,#80H                	; ENABLES GLOBAL
;***********************************
;* MAIN PROGRAM 
;***********************************
MAIN_01:	
	JMP MAIN_01
;***********************************
	END