Rainbow Electronics ATmega128L - Manual (Page 46)

46
ATmega128(L)
2467B–09/01
Figure 21. Reset Logic
Notes: 1. Values are guidelines only. Actual values are TBD.
2. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling)
Table 19. Reset Characteristics (1)
Symbol Parameter Condition Min Typ Max Units
V
POT
Power-on Reset Threshold
Voltage (rising)
TBD TBD 2.3 V
Power-on Reset Threshold
Voltage (falling)
(2)
TBD TBD 2.3 V
V
RST
RESET Pin Threshold Voltage TBD TBD TBD V
t
RST
Minimum pulse width on
RESET Pin
TBD TBD TBD ns
V
BOT
Brown-out Reset Threshold
Voltage BODLEVEL = 1 TBD 2.7 TBD
V
BODLEVEL = 0 TBD 4.0 TBD
t
BOD
Minimum low voltage period for
Brown-out Detection BODLEVEL = 1 TBD TBD TBD µs
BODLEVEL = 0 TBD TBD TBD µs
V
HYST
Brown-out Detector hysteresis TBD 50 TBD 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
D Q
Q
Power-On Reset
Circuit