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Re: [avr-libc-dev] XMega Watchdog clock domains not synchronized?

From: Bob Paddock
Subject: Re: [avr-libc-dev] XMega Watchdog clock domains not synchronized?
Date: Mon, 19 May 2014 09:52:41 -0400

On Tue, Oct 11, 2011 at 2:08 PM, Bob Paddock <address@hidden> wrote:
> Trying to find out why my XMega 128A1 keeps resetting I noticed this
> in the XMega Manual:
> 11.7.3 STATUS – Watchdog Status Register
> Bit 0 - SYNCBUSY
> When writing to the CTRL or WINCTRL registers, the WDT needs to be
> synchronized to the
> other clock domains. During synchronization the SYNCBUSY bit will be
> read as one. This bit is
> automatically cleared after the synchronization is finished.
> Synchronization will only take place
> when the ENABLE bit for the Watchdog Timer is set.
> I do not see where this clock domain synchronization is accounted for
> in avr/wdt.h wdt_enable().
> Am I missing something?
> App Note AVR1321 for the RTC32 explains the cross clock domain  issue,
> however it doesn't really say what happens in the Watchdog or the RTC
> case if things are not in sync.
> Seems like this would cause the watchdog to not be enabled at random
> times when wdt_enable() is used in the XMega parts.

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