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