;-----------------------------------------------------------------------------
;		4/25/2006	sjd
;
;
;
; 	FILE NAME  	:	INOUT23.ASM 
; 	TARGET MCU	:	C8051F120 
; 	DESCRIPTION	:	This program illustrates how to configure the
;                 Crossbar, read and write to port 2 & 3
;                 I/O pins.
;
;
; 	NOTES: 
;
; 	(1) This note intentionally left blank.
;
;
;-----------------------------------------------------------------------------


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

$include (c8051f120.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.

					; Use SFRs on the Configuration Page
Main:			mov SFRPAGE, #CONFIG_PAGE

					; Enable the Port I/O Crossbar
					mov		XBR2, #40h
					
					; P2 input, P3 output.  
					; loop.
Loop: 		mov	R7, P2	; read port 2			
					mov	P3, R7	; write port 3
					jmp	Loop


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

END