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[avr-libc-dev] <avr/wdt.h> documented

From: Joerg Wunsch
Subject: [avr-libc-dev] <avr/wdt.h> documented
Date: Mon, 16 Dec 2002 00:26:46 +0100
User-agent: Mutt/1.2.5i

...Just in case somebody wants to review that.

I also invented symbolic constants for the watchdog timeouts,
describing the approximate expiry time @ Vcc = 5.0 V.  The differences
between the devices are neglicible since it was apparently a design
goal that the oscillator controlling the watchdog timer runs at 1 MHz
@ 5 V.  Thus it makes some sense to have symbolic constants.

The timer will run slower at lower voltage, and that's where
the differences become huge: for all older devices (by design), the
timeout will increase by a factor of ~ 3 when going down to Vcc = 3 V,
while the ATmega128 and ATmega8 experience only little slowdown.
J"org Wunsch                                           Unix support engineer
address@hidden        http://www.interface-systems.de/~j/

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