Watchdog Reset - Atmel ATtiny25 Manual

8.6

Watchdog Reset

7598H–AVR–07/09
When the BOD is enabled, and V
8-5), the Brown-out Reset is immediately activated. When V
(V in Figure 8-5), the delay counter starts the MCU after the Time-out period t
BOT+
expired.
The BOD circuit will only detect a drop in V
ger than t given in Table
BOD
Figure 8-5. Brown-out Reset During Operation
V
CC
RESET
TIME-OUT
INTERNAL
RESET
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
page 41 for details on operation of the Watchdog Timer.
Figure 8-6. Watchdog Reset During Operation
CC
decreases to a value below the trigger level (V
CC
if the voltage stays below the trigger level for lon-
CC
8-1.
V
BOT-
CK
ATtiny25/45/85
BOT-
increases above the trigger level
CC
V
BOT+
t
TOUT
TOUT
in Figure
has
TOUT
. Refer to
39