Yes, you have to make the PROTA pins Digital IO instead of Analog Inputs
for the AD converter.
Look for ADCON register.

	
Regards,

	
Jim
 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Andrew Kieran
Sent: Thursday, January 25, 2007 2:49 PM
To: piclist@mit.edu
Subject: [PIC]: Simple code not working in MPSIM. Arghh!

I feel pretty silly bringing up this problem, but I've tried everything
I can think of.  I can't run the simple code snippet shown below in the
MPLAB v7.50 simulator.

It is suppossed to set up all PORTA pins as outputs and send 0x0f to the
port.  But after running this in MPSIM, PORTA contains 0x00 rather than
0x0f.

I have checked that the processor include file is there, it defines
PORTA correctly, and it is being used.  A Watch window correctly shows
PORTA at it's 0x05 address.  MPSIM is set for the correct CPU, and
specifiying a radix parameter has no effect.

I tried creating a brand new project and source code files, but the
result was the same.  

Have I run into a bug or did I miss something that is or should have
been glaringly obvious?  Interestingly, it works if I change PORTA/TRISA
to PORTD/TRISD.

Thanks in Advance,
Andrew



	processor     	16f877a		; list directive to define
processor
	#include	P16F877A.INC	; processor specific variable
definitions
	
	__CONFIG _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _HS_OSC &
_LVP_OFF & _DEBUG_OFF & _CPD_OFF


	ORG     0x000			; processor reset vector
	bsf	STATUS, RP0
	clrf	TRISA ^ 0x80
	bcf	STATUS, RP0
	movlw	0x0f
	movwf	PORTA
	goto	$

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