59
9140CINDCO02/10
ATA8741
16.0.5
Brown-out Detection
ATtiny24/44/84 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
CC
level
during operation by comparing it to a fixed trigger level. The trigger level for the BOD can be
selected by the BODLEVEL Fuses. The trigger level has a hysteresis to ensure spike free
Brown-out Detection. The hysteresis on the detection level should be interpreted as V
BOT+
=
V
BOT
+ V
HYST
/2 and V
BOT-
= V
BOT
- V
HYST
/2.
When the BOD is enabled, and V
CC
decreases to a value below the trigger level (V
BOT-
in Figure
16-5 on page 59), the Brown-out Reset is immediately activated. When V
CC
increases above the
trigger level (V
BOT+
in Figure 16-5 on page 59), 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 System and Reset Characterizations on page 198.
Figure 16-5. Brown-out Reset During Operation
16.0.6
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
. See
Watchdog Timer on page 60 for details on operation of the Watchdog Timer.
Figure 16-6. Watchdog Reset During Operation
V
CC
RESET
IME-OUT
NTERNAL
RE ET
V
BOT-
V
BOT+
t
TOUT
CK
CC
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