;-----------------------------------------------------------------------------
;		9/25/2002	sjd
;
;
;
; 	FILE NAME  	:	INOUT01.ASM 
; 	TARGET MCU	:	C8051F000 
; 	DESCRIPTION	:	This program illustrates how to configure the
;                 Crossbar, read and write to port 0 & 1
;                 I/O pins.
;
;
; 	NOTES: 
;
; 	(1) This note intentionally left blank.
;
;
;-----------------------------------------------------------------------------


;-----------------------------------------------------------------------------
; EQUATES
;-----------------------------------------------------------------------------

$include (c8051f000.inc)					; Include register definition file.


;-----------------------------------------------------------------------------
; VARIABLES
;-----------------------------------------------------------------------------

;-----------------------------------------------------------------------------
; RESET and INTERRUPT VECTORS
;-----------------------------------------------------------------------------


           ; Reset Vector
           cseg AT 0
           ljmp Main                 ; Locate a jump to the start of code at 
                                     ; the reset vector.

;-----------------------------------------------------------------------------
; CODE SEGMENT
;-----------------------------------------------------------------------------

Code_Seg  segment  CODE

          rseg     Code_Seg          ; Switch to this code segment.
          using    0                 ; Specify register bank for the following
                                     ; program code.


					; Enable the Port I/O Crossbar
Main:			mov		XBR2, #40h
					;P0 input, P1 output.  Make sure jumpers J3 & J1 are removed to
					;use all 8 bits on port P1.  The on-board LED D3 and SW2 are connected
					;to P1.6 and P1.7
					;loop.
Blink:		mov	R7, P0	;read port 0			
					mov	P1, R7	;write port1
					jmp	Blink


;-----------------------------------------------------------------------------
; End of file.

END