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Discussion Groups | Piclist | PIC18 RB pullups ?
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.
PIC18 RB pullups ? - Eirik Karlsen - Apr 9 4:45:42 2006
PIC18242 has internal pullups on RB but from the datasheet it seems that
they only pertain to inputs.
How about when RB is an all outputs ?
Do I have to use external pullups for driving 1mA loads or are the RB
outputs real totem pole ?
The datasheet is not clear on this.
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LAST UPDATED: 23/08/2003
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Eirik Karlsen
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they only pertain to inputs.
How about when RB is an all outputs ?
Do I have to use external pullups for driving 1mA loads or are the RB
outputs real totem pole ?
The datasheet is not clear on this.
--
*******************************************
VISIT MY HOME PAGE:
LAST UPDATED: 23/08/2003
*******************************************
Regards
Eirik Karlsen
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )
Re: PIC18 RB pullups ? - rtstofer - Apr 9 16:53:22 2006
--- In p...@yahoogroups.com, Eirik Karlsen wrote:
>
> PIC18242 has internal pullups on RB but from the datasheet it seems that
> they only pertain to inputs.
> How about when RB is an all outputs ?
> Do I have to use external pullups for driving 1mA loads or are the RB
> outputs real totem pole ?
> The datasheet is not clear on this.
>
> --
> *******************************************
> VISIT MY HOME PAGE:
>
> LAST UPDATED: 23/08/2003
> *******************************************
> Regards
> Eirik Karlsen
>
I would think spec D090 in section 22.2 of the datasheet
(http://ww1.microchip.com/downloads/en/DeviceDoc/39564b.pdf) is fairly
specific. The PIC on all pins not listed in D092, can source 3.0 mA
while maintaining an output voltage of Vdd -0.7V. This is pretty
typical for Microchip PICs.
Richard
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>
> PIC18242 has internal pullups on RB but from the datasheet it seems that
> they only pertain to inputs.
> How about when RB is an all outputs ?
> Do I have to use external pullups for driving 1mA loads or are the RB
> outputs real totem pole ?
> The datasheet is not clear on this.
>
> --
> *******************************************
> VISIT MY HOME PAGE:
>
> LAST UPDATED: 23/08/2003
> *******************************************
> Regards
> Eirik Karlsen
>
I would think spec D090 in section 22.2 of the datasheet
(http://ww1.microchip.com/downloads/en/DeviceDoc/39564b.pdf) is fairly
specific. The PIC on all pins not listed in D092, can source 3.0 mA
while maintaining an output voltage of Vdd -0.7V. This is pretty
typical for Microchip PICs.
Richard
to unsubscribe, go to http://www.yahoogroups.com and follow the instructions
(You need to be a member of piclist -- send a blank email to piclist-subscribe@yahoogroups.com )