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Discussion Groups | LPC2000 | PINMODE effective for GPIO only?
Discussion group dedicated to the Philips LPC2000 family of ARM MCUs
PINMODE effective for GPIO only? - reich_wolfgang - Oct 9 13:20:47 2009
LPC24xx:
For GPIO port pins, does the PINMODE pull up/down setting also have effect when the pin is configured not for GPIO, but for other functions?
The manual says "The PINMODE registers control the on-chip pull-up/pull-down resistor feature for all GPIO ports."
I'm not sure if this means GPIO-accessible ports in general or only ports actually configured for GPIO function.
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For GPIO port pins, does the PINMODE pull up/down setting also have effect when the pin is configured not for GPIO, but for other functions?
The manual says "The PINMODE registers control the on-chip pull-up/pull-down resistor feature for all GPIO ports."
I'm not sure if this means GPIO-accessible ports in general or only ports actually configured for GPIO function.
------------------------------------
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Re: PINMODE effective for GPIO only? - rolf_meeser - Oct 10 14:35:38 2009
Hi Wolfgang,
--- In l...@yahoogroups.com, "reich_wolfgang" wrote:
>
> LPC24xx:
> For GPIO port pins, does the PINMODE pull up/down setting also have effect when the pin is configured not for GPIO, but for other functions?
> The manual says "The PINMODE registers control the on-chip pull-up/pull-down resistor feature for all GPIO ports."
> I'm not sure if this means GPIO-accessible ports in general or only ports actually configured for GPIO function.
>
The PINMODE setting is independent of the PINSEL setting. The pull-ups/-downs can be used for instance when the pin is used as UART RX line.
Rolf
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______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
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--- In l...@yahoogroups.com, "reich_wolfgang"
>
> LPC24xx:
> For GPIO port pins, does the PINMODE pull up/down setting also have effect when the pin is configured not for GPIO, but for other functions?
> The manual says "The PINMODE registers control the on-chip pull-up/pull-down resistor feature for all GPIO ports."
> I'm not sure if this means GPIO-accessible ports in general or only ports actually configured for GPIO function.
>
The PINMODE setting is independent of the PINSEL setting. The pull-ups/-downs can be used for instance when the pin is used as UART RX line.
Rolf
------------------------------------
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )