SAMD10 Reset and SWD lines shared with GPIO lines

Discussions around product based on ARM Cortex M0+ core.
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gussabina
Posts: 12
Joined: Sat Mar 28, 2015 6:49 am

SAMD10 Reset and SWD lines shared with GPIO lines

Mon Aug 15, 2016 9:43 pm

Hello All:

According the SAMD10 datasheet, the Reset line is shared with PA28, and SWD lines with PA30/31.
However, looking at the I/O Multiplexing table, there is no mention of Reset and SDIO lines, so how is this supposed to work?
I mean, is Reset and SDIO lines selected by default? If the user wants to use PA28, how this is selected in the multiplexer? (PA28 is the default function...).

I worked with SAMD21 a lot, but in this case, it's not clear to me how this is supposed to work. Any help?

Thanks
Gus
blue_z
Location: USA
Posts: 1549
Joined: Thu Apr 19, 2007 10:15 pm

Re: SAMD10 Reset and SWD lines shared with GPIO lines

Tue Aug 16, 2016 12:10 am

gussabina wrote:If the user wants to use PA28, how this is selected in the multiplexer?
Instead of a multiplexer selection, the External Reset functionality must be disabled in the Power Manager subsystem.
Refer to the EXTCTRL register.

See section 6.2.2 for SWD configuration.

Regards

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