;******************************************************************
;Ping-pong data move
;This program moves push button switch values from Port A to the 
;leds on Port B. Uses electronic pingpong hardware. 
;TJW 21.2.05					Tested 22.2.05			         Tested 22.2.05
;******************************************************************
;
;Configuration Word: WDT off, power-up timer on, 
;			   code protect off, RC oscillator
;
;specify SFRs
status  equ     03
porta   equ     05
trisa   equ     05
portb   equ     06
trisb   equ     06
;
	org 	00
;Initialise
start	bsf	status,5 	;select memory bank 1
	movlw	B'00011000' 
	movwf	trisa		;port A according to above pattern 
	movlw	00
	movwf	trisb		;all port B bits output
	bcf	status,5 	;select bank 0
;
;The “main” program starts here
	movlw  00		;clear all bits in ports A and B
	movwf  porta
	movwf  portb
loop	movf   porta,0		;move port A to W register
	movwf  portb		;move W register to port B
	goto   loop
	end