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Subject: Re: Re[2]: Use SLEEP instruction for longer (?) runtime

Re: Re[2]: Use SLEEP instruction for longer (?) runtime

From: Björn Stenberg <>
Date: Sat, 25 Jan 2003 16:16:03 +0100

Uwe Freese wrote:
> The alarm out pin (that connection I cut for my alarm mod ;) ) is
> connected to an IRQ pin of the CPU. I think it could be possible to use
> the RTC to wakeup the CPU from Standby.
> As I understand it, Standby mode of the CPU means that it can only woken
> up externally.

Unfortunately it must be an NMI, not just any interrupt.

I though about changing your alarm mod to route it to NMI, but from my casual glance in the RTC docs it looks like it cannot send the alarm more frequently than 1 Hz. In that case, it's hardly useful.

Received on 2003-01-25

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