Atmel ATmega128 User Manual

51
2467S–AVR–07/09
ATmega128
Figure 22. Reset Logic
Notes: 1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling)
Table 19. Reset Characteristics
Symbol Parameter Condition Min Typ Max Units
V
POT
Power-on Reset
Threshold Voltage
(rising)
1.4 2.3 V
Power-on Reset
Threshold Voltage
(falling)
(1)
1.3 2.3 V
V
RST
RESET Pin Threshold
Voltage
0.2 V
CC
0.85 V
CC
V
t
RST
Pulse width on RESET
Pin
1.5 µs
V
BOT
Brown-out Reset
Threshold Voltage
(2)
BODLEVEL = 1 2.4 2.6 2.9
V
BODLEVEL = 0 3.7 4.0 4.5
t
BOD
Minimum low voltage
period for Brown-out
Detection
BODLEVEL = 1 2
µs
BODLEVEL = 0 2
V
HYST
Brown-out Detector
hysteresis
100 mV
MCU Control and Status
Register (MCUCSR)
Brown-Out
Reset Circuit
BODEN
BODLEVEL
Delay Counters
CKSEL[3:0]
CK
TIMEOUT
WDRF
BORF
EXTRF
PORF
DATA BUS
Clock
Generator
SPIKE
FILTER
Pull-up Resistor
JTRF
JTAG Reset
Register
Watchdog
Oscillator
SUT[1:0]
COUNTER RESET
Watchdog
Timer
RESET
Pull-up Resistor
PEN
Reset Circuit
L
DQ
Q
Power-On Reset
Circuit

Atmel ATmega128 Specifications

General

Brand	Atmel
Model	ATmega128
Category	Microcontrollers
Language	English