How to check oscillator frequency


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  1. #1
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    Hi Steve,

    I did read the posts and "still" try to understand it.
    I forgot to mention that I use MPASM 5.03 assembler, because PM does not have inc file for 18F4431 ( or does it ? )

    Melanie said :
    3.b. When using Microchip's (MPASM) Assembler

    If you're going to use MPASM, look for the appropriate file (example for a 16F628 look for P16F628.INC) located in something like the MCHIP_Tools subdirectory of your MPLAB installation. Here you’ll find the Configuration Bits located near the bottom of the list. Simply just use the ones you want. Hey presto your PIC is all defined and ready to run.

    But how ? I am new to PBP, please help


    Thanks,

    Johan

  2. #2
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    Quote Originally Posted by Johan View Post
    I did read the posts and "still" try to understand it.
    Old version. Latest is 5.11. Download MPLAB IDE v 7.61 (maybe 7.62 by now)

    I forgot to mention that I use MPASM 5.03 assembler, because PM does not have inc file for 18F4431 ( or does it ? )
    PM does NOT support 18Fxxxx.

    Melanie said :
    3.b. When using Microchip's (MPASM) Assembler
    If you're going to use MPASM, look for the appropriate file (example for a 16F628 look for P16F628.INC) located in something like the MCHIP_Tools subdirectory of your MPLAB installation. Here you’ll find the Configuration Bits located near the bottom of the list. Simply just use the ones you want. Hey presto your PIC is all defined and ready to run.
    But how ? I am new to PBP, please help
    Edit the file using WORDPAD, NOTEPAD, or any other pad you can find, comment out the config bits you're NOT wanting and un-comment the rest.

  3. #3
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    Wink

    http://www.picbasic.co.uk/forum/showthread.php?t=543
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    <blink>POST #5</blink>
    http://www.picbasic.co.uk/forum/show...75&postcount=5

    Code:
    ;****************************************************************
    ;*  18F4431.INC                                                 *
    ;*                                                              *
    ;*  By        : Leonard Zerman, Jeff Schmoyer                   *
    ;*  Notice    : Copyright (c) 2006 microEngineering Labs, Inc.  *
    ;*              All Rights Reserved                             *
    ;*  Date      : 06/05/06                                        *
    ;*  Version   : 2.47                                            *
    ;*  Notes     :                                                 *
    ;****************************************************************
            NOLIST
        ifdef PM_USED
            LIST
            "Error: PM does not support this device.  Use MPASM."
            NOLIST
        else
            LIST
            LIST p = 18F4431, r = dec, w = -311, w = -230, f = inhx32
            INCLUDE "P18F4431.INC"  ; MPASM  Header
    <BLINK>        ;__CONFIG    _CONFIG1H, _OSC_XT_1H
            ;__CONFIG    _CONFIG2H, _WDTEN_ON_2H & _WDPS_512_2H
            ;__CONFIG    _CONFIG4L, _LVP_OFF_4L</BLINK>
            NOLIST
        endif
            LIST
    EEPROM_START	EQU	0F00000h
    BLOCK_SIZE	EQU	8
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  4. #4
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    Mr. E,
    This is really confusing

    I dont have 18F4431.INC on my PBP folder that you suggested to modify :
    http://www.picbasic.co.uk/forum/show...75&postcount=5

    But I can find 18F4431.INC on MPASM directory
    Shall I copy & paste INC file from MPASM directory to PBP directory and edit it ?

    Skimask: I have installed the new MPASM as you suggested\


    Johan

  5. #5
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    Sure you MUST have that file in the C:\PBP folder unless it wouldn't compile at all. Unfortunately, the one in MPASM Suite folder won't help. The one in MPASM folder DEFINE the PIC registers, Bits, Configuration bits etc etc etc. But, you could still create one using the one i posted above and save it to C:\PBP folder.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  6. #6
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    Thanks Steve,
    It was my mistake , I looked at C:PBP\INC folder instead of C:PBP, that's why I never found the 18F4431.INC file.

    Now, it it configured as your suggestion, and it works ( The Configuration bits on Picflash changed as well , save me some clicks, thanks )

    One more thing, I 'd like to know more about HS PLL mode ( Datasheet 2.3 ). Suppose I want to use external 8 Mhz crystal to produce 32 Mhz clock, what settings are required ?



    Johan
    Last edited by Johan; - 14th July 2007 at 15:01.

  7. #7
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    Quote Originally Posted by P18F4431.INC, MPASM Suite
    ;----- CONFIG1H Options --------------------------------------------------
    _OSC_LP_1H EQU H'F0' ; LP
    _OSC_XT_1H EQU H'F1' ; XT
    _OSC_HS_1H EQU H'F2' ; HS
    _OSC_RC2_1H EQU H'F3' ; External RC, RA6 is CLKOUT
    _OSC_EC_1H EQU H'F4' ; EC, RA6 is CLKOUT
    _OSC_ECIO_1H EQU H'F5' ; EC, RA6 is I/O
    _OSC_HSPLL_1H EQU H'F6' ; HS-PLL Enabled
    _OSC_RCIO_1H EQU H'F7' ; External RC, RA6 is I/O
    _OSC_IRCIO_1H EQU H'F8' ; Internal RC, RA6 & RA7 are I/O
    _OSC_IRC_1H EQU H'F9' ; Internal RC, RA6 is CLKOUT, RA7 is I/O
    _OSC_RC1_1H EQU H'FB' ; External RC, RA6 is CLKOUT
    _OSC_RC_1H EQU H'FF' ; External RC, RA6 is CLKOUT

    _FCMEN_OFF_1H EQU H'BF' ; Disabled
    _FCMEN_ON_1H EQU H'FF' ; Enabled

    _IESO_OFF_1H EQU H'7F' ; Disabled
    _IESO_ON_1H EQU H'FF' ; Enabled

    i bet on...
    Code:
            '
            '       Pic Configuration
            '       =================
            ASM         
            __CONFIG _CONFIG1H, _OSC_HSPLL_1H  & _FCMEN_OFF_1H & _IESO_OFF_1H
            __CONFIG _CONFIG2L, _PWRTEN_ON_2L & _BOREN_ON_2L & _BORV_45_2L
            __CONFIG _CONFIG2H, _WDTEN_OFF_2H & _WINEN_OFF_2H 
            __CONFIG _CONFIG3L, _T1OSCMX_OFF_3L & _HPOL_LOW_3L & _LPOL_HIGH_3L & _PWMPIN_OFF_3L
            __CONFIG _CONFIG3H, _MCLRE_ON_3H
            __CONFIG _CONFIG4L, _LVP_OFF_4L & _DEBUG_OFF_4L
            ENDASM
            DEFINE OSC 32
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

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