
189
8197C–AVR–05/11
ATtiny261A/461A/861A
19.5.1
Enhanced Power-On Reset
Note:
1. Values are guidelines, only.
2. Threshold where device is released from reset when voltage is rising.
3. The Power-on Reset will not work unless the supply voltage has been below VPOA.
19.5.2
Brown-Out Detection
Note:
1. V
BOT may be below nominal minimum operating voltage for some devices. For devices where
this is the case, the device is tested down to VCC = VBOT during the production test. This guar-
antees that a Brown-out Reset will occur before V
CC drops to a voltage where correct
operation of the microcontroller is no longer guaranteed.
Table 19-5.
Characteristics of Enhanced Power-On Reset. T
A = -40 to +85°C
Symbol
Parameter
Units
VPOR
Release threshold of power-on reset
(2)1.1
1.4
1.6
V
VPOA
Activation threshold of power-on reset
(3)0.6
1.3
1.6
V
SRON
Power-On Slope Rate
0.01
V/ms
Table 19-6.
BODLEVEL[2:0] Fuses
Min VBOT
Typ VBOT
Max VBOT
Units
111
BOD Disabled
110
1.7
1.8
2.0
V
101
2.5
2.7
2.9
100
4.1
4.3
4.5
0XX
Reserved