ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 43

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ATmega88PA Automotive

Manufacturer Part Number
ATmega88PA Automotive
Description
Manufacturer
Atmel Corporation
9.5
9.6
7701E–AVR–02/11
Brown-out Detection
Watchdog Reset
Figure 9-4.
ATtiny24/44/84 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
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
When the BOD is enabled, and V
ure 9-5 on page
above the trigger level (V
after the Time-out period t
The BOD circuit will only detect a drop in V
ger than t
Figure 9-5.
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
“Watchdog Timer” on page 44
BOT+
= V
BOD
BOT
CC
given in
+ V
INTERNAL
TIME-OUT
External Reset During Operation
Brown-out Reset During Operation
RESET
RESET
HYST
43), the Brown-out Reset is immediately activated. When V
V
CC
/2 and V
“System and Reset Characterizations” on page
TOUT
BOT+
Atmel ATtiny24/44/84 [Preliminary]
BOT-
for details on operation of the Watchdog Timer.
has expired.
in
CC
Figure 9-5 on page
= V
decreases to a value below the trigger level (V
V
BOT
BOT-
- V
CC
HYST
if the voltage stays below the trigger level for lon-
/2.
43), the delay counter starts the MCU
V
t
TOUT
BOT+
181.
CC
BOT-
increases
TOUT
CC
in
. See
level
Fig-
43

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