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Discussion Groups | Piclist | Re: 12F675 Startup Problems
A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.
Re: 12F675 Startup Problems - kg4pid - Dec 8 1:51:47 2007
To make it work I had to change the the value that gets moved into
OSCCAL. Since the serial routine that I used had been around awhile
I can only assume that the problem is in the Pic oscilator. Don't
know what to do to fix it though as I don't want to have to
calibrate each pic chip.
Max
--- In p...@yahoogroups.com, "kg4pid" wrote:
>
> I'm using a serial routine on a 12F675 and started by sending out
the
> word "HELLO" over and over. Funny thing is while it's powered on I
get
> nothing out, but the instant I remove power it sends out 10 or 11
> characters. The filter cap is powering it for that fraction of a
> second. The circuit is being powered by a 9V battery with a 78L05
to
> regulate it at 5V. My meter reads 4.99v at the pic chip. A logic
probe
> connected to the output blinks the whole time it is powered up
which
> should mean that its sending something. I had to include this bit
of
> code at the very beginning before I got anything at all.
> call 0x3FF ; Retrieve Factory Calibration
> BANKSEL OSCCAL ; BANK1
> movwf OSCCAL
>
> Anyone have any ideas as to what might cause a problem like this?
>
> Thanks, Max
>
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______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
OSCCAL. Since the serial routine that I used had been around awhile
I can only assume that the problem is in the Pic oscilator. Don't
know what to do to fix it though as I don't want to have to
calibrate each pic chip.
Max
--- In p...@yahoogroups.com, "kg4pid"
>
> I'm using a serial routine on a 12F675 and started by sending out
the
> word "HELLO" over and over. Funny thing is while it's powered on I
get
> nothing out, but the instant I remove power it sends out 10 or 11
> characters. The filter cap is powering it for that fraction of a
> second. The circuit is being powered by a 9V battery with a 78L05
to
> regulate it at 5V. My meter reads 4.99v at the pic chip. A logic
probe
> connected to the output blinks the whole time it is powered up
which
> should mean that its sending something. I had to include this bit
of
> code at the very beginning before I got anything at all.
> call 0x3FF ; Retrieve Factory Calibration
> BANKSEL OSCCAL ; BANK1
> movwf OSCCAL
>
> Anyone have any ideas as to what might cause a problem like this?
>
> Thanks, Max
>
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )