ATTINY26L8SU SL383 Atmel, ATTINY26L8SU SL383 Datasheet - Page 36

• Manufacturer Part Number: ATTINY26L8SU SL383
• Description: MCU 8-Bit ATtiny AVR RISC 2KB Flash 3.3V/5V 20-Pin SOIC T/R
• Manufacturer: Atmel

Brown-out Detection
Watchdog Reset
36
ATtiny26(L)
ATtiny26(L) has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
level during the operation. The BOD circuit can be enabled/disabled by the fuse
BODEN. When the BOD is enabled (BODEN programmed), and V
the trigger level, the Brown-out Reset is immediately activated. When V
above the trigger 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 29. The trigger
level for the BOD can be selected by the fuse BODLEVEL to be 2.7V (BODLEVEL
unprogrammed), or 4.0V (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 t
Figure 29. Brown-out Reset During Operation
When the Watchdog times out, it will generate a short reset pulse of one CK cycle dura-
tion. On the falling edge of this pulse, the delay timer starts counting the Time-out period
t
Figure 30. Watchdog Time-out
TOUT
INTERNAL
TIME-OUT
RESET
RESET
. Refer to page 80 for details on operation of the Watchdog.
V
CC
BOD
given in Table 16.
V
BOT-
1 CK Cycle
CC
if the voltage stays below the trigger level
V
t
TOUT
BOT+
CC
decreases below
1477J–AVR–06/07
CC
increases
CC