How to check oscillator frequency

**mister_e** · - 12th July 2007, 19:23

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

**Johan** · - 13th July 2007, 08:36

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

**mister_e** · - 13th July 2007, 23:55

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.

**Johan** · - 14th July 2007, 14:43

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

**mister_e** · - 14th July 2007, 15:23

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

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