ATTINY26L8SU SL383 Atmel, ATTINY26L8SU SL383 Datasheet - Page 34

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

Power-on Reset
34
ATtiny26(L)
Table 16. Reset Characteristics
Notes:
See start-up times from reset from “System Clock and Clock Options” on page 24.
When the CPU wakes up from Power-down, only the clock counting part of the start-up
time is used. The Watchdog Oscillator is used for timing the real-time part of the start-up
time.
A Power-on Reset (POR) pulse is generated by an On-chip Detection circuit. The detec-
tion level is defined in Table 16 The POR is activated whenever V
detection level. The POR circuit can be used to trigger the Start-up Reset, as well as
detect a failure in supply voltage.
The Power-on Reset (POR) circuit ensures that the device is reset from Power-on.
Reaching the Power-on Reset threshold voltage invokes a delay counter, which deter-
mines the delay, for which the device is kept in RESET after V
period of the delay counter can be defined by the user through the CKSEL Fuses. The
different selections for the delay period are presented in “System Clock and Clock
Options” on page 24. The RESET signal is activated again, without any delay, when the
V
Symbol
CC
V
V
V
V
t
t
BOD
RST
HYST
POT
RST
BOT
decreases below detection level.
1. The Power-on Reset will not work unless the supply voltage has been below V
2. V
(falling)
devices where this is the case, the device is tested down to V
production test. This guarantees that a Brown-out Reset will occur before V
to a voltage where correct operation of the microcontroller is no longer guaranteed.
The test is performed using BODLEVEL=1 for ATtiny26L and BODLEVEL=0 for
ATtiny26. BODLEVEL=1 is not applicable for ATtiny26.
Parameter
Power-on Reset Threshold
Voltage (rising)
Power-on Reset Threshold
Voltage (falling)
RESET Pin Threshold Voltage
Minimum pulse width on
RESET Pin
Brown-out Reset Threshold
Voltage
Minimum low voltage period for
Brown-out Detection
Brown-out Detector hysteresis
BOT
may be below nominal minimum operating voltage for some devices. For
(2)
(1)
BODLEVEL = 1
BODLEVEL = 0
BODLEVEL = 1
BODLEVEL = 0
Condition
Min
0.2
2.4
3.7
CC
Typ
130
1.4
1.3
2.7
4.0
2
2
CC
rise. The time-out
CC
= V
Max
1477J–AVR–06/07
2.3
2.3
0.9
1.5
2.9
4.5
is below the
BOT
during the
CC
Units
V
mV
µs
µs
µs
drops
V
V
V
CC
POT