PWMPAL Question
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Posts: 46,084
I'm using two PWMPAL outputs(P13 & P14) to drive two power logic level
FETs
via 220ohm gate resistors. In addition I would like to use P15 as an output
to a OneWire
device and P12 as a simple on/off output(via 220ohm res) to a logic level
FET. In
reading the PWMPAL documentation, it is unclear to me whether this will
cause conflicts.
Do I need to use outputs other than P12 and P15 for this?
Thanks fo any help/info.
Tom Fisher
Dallas,TX
FETs
via 220ohm gate resistors. In addition I would like to use P15 as an output
to a OneWire
device and P12 as a simple on/off output(via 220ohm res) to a logic level
FET. In
reading the PWMPAL documentation, it is unclear to me whether this will
cause conflicts.
Do I need to use outputs other than P12 and P15 for this?
Thanks fo any help/info.
Tom Fisher
Dallas,TX
Comments
I think that will work fine. I have done a similar scheme with success.
Jonathan
www.madlabs.info
Original Message
From: "TBooneFisher" <tboonefisher@s...>
To: <basicstamps@yahoogroups.com>
Cc: <support@p...>
Sent: Tuesday, June 08, 2004 9:13 AM
Subject: [noparse][[/noparse]basicstamps] PWMPAL Question
> I'm using two PWMPAL outputs(P13 & P14) to drive two power logic level
> FETs
> via 220ohm gate resistors. In addition I would like to use P15 as an
output
> to a OneWire
> device and P12 as a simple on/off output(via 220ohm res) to a logic level
> FET. In
> reading the PWMPAL documentation, it is unclear to me whether this will
> cause conflicts.
> Do I need to use outputs other than P12 and P15 for this?
> Thanks fo any help/info.
> Tom Fisher
> Dallas,TX
>
>
>
>
>
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All PWMPAL I/Os default to an input state. So P12 & P15 can be used by the stamp as I/O to your needs.
Regards,
Chuck
> All PWMPAL I/Os default to an input state. So P12 & P15 can be used by the
stamp as I/O to your needs.
>
> Regards,
> Chuck
>
Thanks Chuck. So just to verify, IF I only enable PWM on
one or two of the PWM out pins, the other PWM output pins
can be used for normal I/O e.g. OWOUT, OWIN etc.
The reason I ask is that I have one of the beta PWMPAL
modules(higher clock speed). If I enable PWM on MM2(P13) then OWIN and
OWOUT commands fail on Pin 15. When I replace the
beta PWMPAL with a standard PWMPAL, the OW commands
then work.
I haven't been able to try to track this down with a scope yet
as I'm busy trying to get other circuitry/software going on
a new protype I'm working on.
Any thoughts will be appreciated.
Thanks,
Tom Fisher
Dallas,TX