AT90PWM2B-16SE ATMEL [ATMEL Corporation], AT90PWM2B-16SE Datasheet - Page 46

• Manufacturer Part Number: AT90PWM2B-16SE
• Description: 8-bit Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

9.0.3
46
AT90PWM2/3/2B/3B
Power-on Reset
Figure 9-1.
Table 9-1.
Notes:
A Power-on Reset (POR) pulse is generated by an On-chip detection circuit. The detection level
is defined in
POR circuit can be used to trigger the start-up Reset, as well as to detect a failure in supply
voltage.
A Power-on Reset (POR) circuit ensures that the device is reset from Power-on. Reaching the
Power-on Reset threshold voltage invokes the delay counter, which determines how long the
device is kept in RESET after V
when V
Symbol
V
V
t
RST
POT
RST
CC
BODLEVEL [2..0]
1. Values are guidelines only..
2. The Power-on Reset will not work unless the supply voltage has been below V
decreases below the detection level.
Parameter
Power-on Reset Threshold
Voltage (rising)
Power-on Reset Threshold
Voltage (falling)
Minimum pulse width on RESET
Pin
RESET Pin Threshold Voltage
Table
Reset Logic
Reset Characteristics
9-1. The POR is activated whenever V
Pull-up Resistor
(2)
Spike
Filter
CC
rise. The RESET signal is activated again, without any delay,
(1)
CKSEL[3:0]
Power-on Reset
Reset Circuit
SUT[1:0]
Brown-out
Watchdog
Oscillator
Generator
Circuit
Clock
Condition
CK
Register (MCUSR)
MCU Status
DATA BUS
Delay Counters
CC
0.2Vcc
is below the detection level. The
Min.
Typ.
400
1.4
1.3
TIMEOUT
0.85Vcc
POT
Max.
4317J–AVR–08/10
2.3
2.3
(falling)
Units
ns
V
V
V