18F25K20 osc setting problem

[Gevo]

Hi every one,

On a older application with the 18F25K20 I need some more I/O. So, I remove the crystal to get RA6 and RA7 available.

Now I want to switch to the internal osc and try this working with @_CONFIG_CONFIG1H_FOSC_INTIO67 but nothing happend.

OSCCON = % 01110000 ' set to 8MHz
OSCTUNE = % 00000000 ' set PLL off

For control I connect a LED to a I/O. When I put the crystal back, the LED is flashing...

The software is written in Pro 2.60C and MPASM is using.

In MicroCode Studio Plus the Device set to PIC18F25K20 and the compiler give no errors.

[mackrackit]

Your OSCCON setting is for 16 MHz

Change INTIO67
to
INTOSCIO

[Gevo]

Hi Dave,

You right about the OSCCON. I set this to %01100000 for 8MHz. speed.

I try to change INTOSCIO but no LED flashing...

[mackrackit]

Post your code and configs.

[Gevo]

Hi Dave,

This my program.

asm
@_CONFIG_CONFIG1H_FOSC_INTIO67
endasm

OSCCON = %01100000 ' OSC Control register to 8MHz
OSCTUNE = %00000000 ' 16 MHz PLL Off bit 6=0, 64MHz PLL On bit 6=1

DEFINE OSC 8 ' Inform PBP for 8 MHz

' Hardware initialization
ANSEL = 0 ' all I/O to digital
ANSELH = 0 '

Led var PORTA.0


' ----- [ Program Code ] ------------------------------------------------------

Main:

High LED ' LED On
pause 200
low LED ' And off....
pause 300

goto Main

[mackrackit]

I read something wrong the first time.

Try

    @ __CONFIG    _CONFIG1H, _FOSC_INTIO67_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
    @ __CONFIG    _CONFIG2H, _WDTEN_ON_2H & _WDTPS_512_2H
    @ __CONFIG    _CONFIG3H, _CCP2MX_PORTC_3H & _PBADEN_OFF_3H & _LPT1OSC_OFF_3H & _HFOFST_ON_3H & _MCLRE_ON_3H
    @ __CONFIG    _CONFIG4L, _STVREN_ON_4L & _LVP_OFF_4L & _XINST_OFF_4L

CM1CON0 = 0
CM2CON0 = 0

Along with your other settings. But I do not have this chip to test...

[Gevo]

Thanks Dave,

A lott of errors. like:

(,) illegal character

(_CONFIG1H) illegal opcode
(_CONFIG2H) illegal opcode
(_CONFIG3H) illegal opcode
(_CONFIG4L) illegal opcode

The 18F25K20 is the same as on the Amicus18 boards. I read about some problem with MPASM for this PIC.

[towlerg]

@Gevo What version of the compiler are you using?

George

[towlerg]

@Gevo What version of the compiler are you using?

George