Datasheet

52
2490R–AVR–02/2013
ATmega64(L)
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
RST
RESET Pin Threshold
Voltage
0.2 V
CC
0.85 V
CC
t
RST
Minimum pulse width on
RESET
Pin
1.5 µs
V
BOT
Brown-out Reset
Threshold Voltage
(2)
BODLEVEL = 1 2.5 2.7 2.9
V
BODLEVEL = 0 3.6 4.0 4.2
t
BOD
Minimum low voltage
period for Brown-out
Detection
BODLEVEL = 1 2
µs
BODLEVEL = 0 2
V
HYST
Brown-out Detector
hysteresis
120 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 BU S
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