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Discussion Groups | AT91SAM ARM | ask info about status of I/O in Reset State (AT91SAM7S256)
For users of the Atmel AT91SAM7 and AT91SAM9 ARM CPU chips. Atmel has taken a new direction by combining on chip flash and ram with the ARM CPU on a single die. This provides low cost devices for small systems using the ARM CPU. This group is to exchange information to help users get started and learn how to use the devices.
ask info about status of I/O in Reset State (AT91SAM7S256) - michael angelo - Jun 3 0:34:30 2008
Dear All,
In Reset state for AT91SAM7S256, all the I/O port will be active High by default. Is there any
possibility we can change to low state for I/O at Reset condition ?
Thank you.
Regards
Bunfai
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
In Reset state for AT91SAM7S256, all the I/O port will be active High by default. Is there any
possibility we can change to low state for I/O at Reset condition ?
Thank you.
Regards
Bunfai
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Re: ask info about status of I/O in Reset State (AT91SAM7S256) - Charles Manning - Jun 3 2:15:19 2008
On Tuesday 03 June 2008 16:34:19 michael angelo wrote:
> Dear All,
>
> In Reset state for AT91SAM7S256, all the I/O port will be active High by
> default. Is there any possibility we can change to low state for I/O at
> Reset condition ?
They are pulled up IOs. You can defeat them by pulling low with an external
resistor.
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
> Dear All,
>
> In Reset state for AT91SAM7S256, all the I/O port will be active High by
> default. Is there any possibility we can change to low state for I/O at
> Reset condition ?
They are pulled up IOs. You can defeat them by pulling low with an external
resistor.
------------------------------------
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Re: ask info about status of I/O in Reset State (AT91SAM7S256) - michael angelo - Jun 4 0:11:50 2008
Actually, I could not pull low the signal, because my system have the power chip using
active low to shutdown. If I put pull down external resistor then the system will never
turn on again. Do we have have any possibility setting from the register to pull down the
pin from power on reset ? If not, I might need to change the power circuit state.
Thanks for all your attention.
Best Regards
Bunfai
Charles Manning wrote:
On Tuesday 03 June 2008 16:34:19 michael angelo wrote:
> Dear All,
>
> In Reset state for AT91SAM7S256, all the I/O port will be active High by
> default. Is there any possibility we can change to low state for I/O at
> Reset condition ?
They are pulled up IOs. You can defeat them by pulling low with an external
resistor.
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )
Thanks for all your attention.
Best Regards
Bunfai
Charles Manning
On Tuesday 03 June 2008 16:34:19 michael angelo wrote:
> Dear All,
>
> In Reset state for AT91SAM7S256, all the I/O port will be active High by
> default. Is there any possibility we can change to low state for I/O at
> Reset condition ?
They are pulled up IOs. You can defeat them by pulling low with an external
resistor.
(You need to be a member of AT91SAM -- send a blank email to AT91SAM-subscribe@yahoogroups.com )