TINY12 ATMEL [ATMEL Corporation], TINY12 Datasheet - Page 22

• Manufacturer Part Number: TINY12
• Description: 8-bit AVR Microcontroller with 1K Byte Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Brown-out Detection
(ATtiny12)
22
ATtiny11/12
Figure 20. External Reset during Operation
ATtiny12 has an on-chip brown-out detection (BOD) circuit for monitoring the V
during the operation. The BOD circuit can be enabled/disabled by the fuse BODEN.
When BODEN is enabled (BODEN programmed), and V
level, the brown-out reset is immediately activated. When V
ger level, the brown-out reset is deactivated after a delay. The delay is defined by the
user in the same way as the delay of POR signal, in Table 5. The trigger level for the
BOD can be selected by the fuse BODLEVEL to be 1.8V (BODLEVEL unprogrammed),
or 2.7V (BODLEVEL programmed). The trigger level has a hysteresis of 50 mV to
ensure spike-free brown-out detection.
The BOD circuit will only detect a drop in V
for longer than 7 µs for trigger level 2.7V, 24 µs for trigger level 1.8V (typical values).
Figure 21. Brown-out Reset during Operation (ATtiny12)
Note:
INTERNAL
TIME-OUT
INTERNAL
TIME-OUT
RESET
RESET
RESET
RESET
V
CC
V
The hysteresis on V
CC
V
RST
BOT
: V
BOT +
V
BOT-
= V
t
BOT
TOUT
+ 25 mV, V
CC
if the voltage stays below the trigger level
BOT-
= V
CC
BOT
decreases below the trigger
CC
V
t
TOUT
- 25 mV.
increases above the trig-
BOT+
1006D–AVR–07/03
CC
level