12F683 - how to set it to use external 4 MHz clock?

[jimbostlawrence]

Hi there,

I'm new to all this PIC business but loving it! I'm using a 12F683 to output a HPWM on pin 5 no problem. I'm also trying to bit bang data to it on the serial but on pins 6/7, which generally works but does get some garbage through. I've opted to fit a 4 MHz crystal oscillator to pins 2/3. My problem is non-familiarity with PBP! I've been looking at how to set the PIC to use the external oscillator instead of the internal however PBP just gives an error. I've been reading for hours and seem to be getting myself stuck in a loop!
The error I'm getting at the moment for:

@ DEVICE XT_OSC
DEFINE OSC 4

is:

Warning[207] e:\.............\test.asm 47 : Found label after column 1. (DEVICE)
Error[122] e:\...............\test.asm 47 : Illegal opcod (XT_OSC)

I know it is going to be something stupid that I've not done but just getting lost in all the jargon.

Cheers

Jimbo

[mehmetOzdemir]

There must be no spaces before @ statement.

"@" must be at the begining of row.

[jimbostlawrence]

Hi there,

Many thanks for your prompt reply. I now accepts the @DEVICE bit but says XT_OSC is an illegal opcode (also tried _XT_OSC).

Any ideas?

Cheers

Jimbo

[mehmetOzdemir]

- xt_osc is an illegal opcode


i think you use mpasm.

USE PM.

DONT SELLECT "USE MPASM BOX" AT THE COMPILE AND PROGRAM OPTIONS.

[jimbostlawrence]

It progressess!

It's actually picbasic pro compiler 2.50 I'm using. I unticked 'use mpasm' box as you suggested.

Now it says "Error TEST.ASM 47 : [235] opcode expected instead of _xt_osc"

???!

[mehmetOzdemir]

Remove "_"

use
@ device xt_osc

[mackrackit]

For PM

@ device  pic12F683, xt_osc, wdt_on, mclr_on, protect_off

FOR MPASM

@ __config _XT_OSC & _WDT_ON & _MCLRE_ON & _CP_OFF

[jimbostlawrence]

Hi there,

Run into more problems now lol. With 'use mpasm' unticked, I can no longer use mplab ide to build/upload the file to the pic. It gives a stream of errors.

However, if I tick the 'use mpasm' again, I get errors in picbasic pro:

Warning[207] e:\.......\sertest.asm 93 : Found label after column 1. (device)
Error[122] e:\.......\sertest.asm 93 : Illegal opcode (pic12F683)

for code:

#####################################
@ device pic12F683, xt_osc, wdt_on, mclr_on, protect_off
DEFINE OSC 4
Include "modedefs.bas"
OSCCON = %00001000
ANSEL=0
CMCON0=%00000111
pw var byte
led var gpio.4
OSCCON=%01110000
oldpwm var byte
#########################################

etc...

I think I basically don't understand how these applications work together creating multiple files that are all linked together... I come from the old school - one program and run!

[jimbostlawrence]

oooh further to my last I think I misunderstood what you said Dave... so I switched to the:

@ __config _XT_OSC & _WDT_ON & _MCLRE_ON & _CP_OFF

and now the error I get in the compiler is Error[118] e:\....\sertest.asm 93 : Overwriting previous address contents (2007)

?!

Is this perhaps related to my program and not this config aspect?