Using MCLR pin at Input

[HenrikOlsson]

Hi,
To me it looks like you're doing everything right though neither ANSEL nor CMCON should have any effect on GP3 operation.
However, I don't know the details on how meProg works. Is it possible that what it's actually programming into the chip is STILL what the code says - the default config for the 12F683 is MCLR enabled?

I guess you can always try that by changing the oscillator setting in meProg and program the chip, if it STILL runs then there's something going on with the CONFIG bits not being programmed to the settings showed in meProg.

I'm sorry for not having a definitive answer.

/Henrik.

[aerostar]

I have this in my program (PBP2.60C) and am using GP3 as an input and it works fine.

@ DEVICE PIC12F683, intrc_osc_noclkout, wdt_on, mclr_off, protect_off , bod_on

INCLUDE "ALLDIGITAL.pbp"

The ALLDIGITAL.pbp just makes sure I have everything set as digital.


The problem is that the PBP assembler uses mclr and mpasm uses MCLRE , see the .inc file

;****************************************************************
;*  12F683.INC                                                  *
;*                                                              *
;*  By        : Leonard Zerman, Jeff Schmoyer                   *
;*  Notice    : Copyright (c) 2005 microEngineering Labs, Inc.  *
;*              All Rights Reserved                             *
;*  Date      : 08/31/05                                        *
;*  Version   : 2.46a                                           *
;*  Notes     :                                                 *
;****************************************************************
        NOLIST
    ifdef PM_USED
        LIST
        include 'M12F683.INC'	; PM header
        device  pic12F683, intrc_osc_noclkout, wdt_on, mclr_on, protect_off
        XALL
        NOLIST
    else
        LIST
        LIST p = 12F683, r = dec, w = -302
        INCLUDE "P12F683.INC"	; MPASM  Header
        __config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_ON & _CP_OFF
        NOLIST
    endif
        LIST

[mpgmike]

"device pic12F683, intrc_osc_noclkout, wdt_on, mclr_on, protect_off"
"__config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_ON & _CP_OFF"

I believe to use the MCLRE pin as a digital input these 2 lines must read "mclr_off" and "_MCLRE_OFF"

Mike

[aerostar]

"device pic12F683, intrc_osc_noclkout, wdt_on, mclr_on, protect_off"
"__config _INTRC_OSC_NOCLKOUT & _WDT_ON & _MCLRE_ON & _CP_OFF"

I believe to use the MCLRE pin as a digital input these 2 lines must read "mclr_off" and "_MCLRE_OFF"

Mike

But ONLY if you always want it OFF - and then have to remember to change it in the program, when you want it on.

The inc file is for general use, and idealy should be left unchanged, - you use the config statements in your program to over ride, as per the statement at top of post 3

@ DEVICE PIC12F683, intrc_osc_noclkout, wdt_on, mclr_off, protect_off , bod_on