ATmega128
Figure 22. Reset Logic
DATA BUS
PEN
D
Q
MCU Control and Status
Register (MCUCSR)
L
Q
Pull-up Resistor
Power-On Reset
Circuit
BODEN
BODLEVEL
Pull-up Resistor
Brown-Out
Reset Circuit
RESET
SPIKE
FILTER
JTAG Reset
Register
Reset Circuit
Watchdog
Timer
Watchdog
Oscillator
Table 19. Reset Characteristics
Clock
Generator
CKSEL[3:0]
SUT[1:0]
CK
Delay Counters
TIMEOUT
Symbol
Parameter
Condition
Min
Typ
Max
Units
Power-on Reset
Threshold Voltage
(rising)
1.4
2.3
V POT
Power-on Reset
Threshold Voltage
1.3
2.3
V
(falling) (1)
V RST
t RST
RESET Pin Threshold
Voltage
Pulse width on RESET
Pin
0.2 V CC
1.5
0.85 V CC
μs
Brown-out Reset
BODLEVEL = 1
2.4
2.6
2.9
V BOT
Threshold Voltage (2)
BODLEVEL = 0
3.7
4.0
4.5
V
Minimum low voltage
BODLEVEL = 1
2
t BOD
V HYST
period for Brown-out
Detection
Brown-out Detector
hysteresis
BODLEVEL = 0
2
100
μs
mV
Notes:
1. The Power-on Reset will not work unless the supply voltage has been below V POT (falling)
50
2467X–AVR–06/11
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