ATMEGA8L ATMEL [ATMEL Corporation], ATMEGA8L Datasheet - Page 36

• Manufacturer Part Number: ATMEGA8L
• Description: 8-bit AVR with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

36
ATmega8(L)
Figure 14. Reset Logic
Table 15. Reset Characteristics
Notes:
Symbol
V
V
V
V
t
t
BOD
RST
HYST
POT
RST
BOT
BODLEVEL
1. The Power-on Reset will not work unless the supply voltage has been below V
2. V
BODEN
(falling).
devices where this is the case, the device is tested down to V
production test. This guarantees that a Brown-out Reset will occur before V
to a voltage where correct operation of the microcontroller is no longer guaranteed.
The test is performed using BODLEVEL = 1 for ATmega8L and BODLEVEL = 0 for
ATmega8. BODLEVEL = 1 is not applicable for ATmega8.
Parameter
Power-on Reset Threshold
Voltage (rising)
Power-on Reset Threshold
Voltage (falling)
RESET Pin Threshold Voltage
Minimum pulse width on
RESET Pin
Brown-out Reset Threshold
Voltage
Minimum low voltage period for
Brown-out Detection
Brown-out Detector hysteresis
BOT
may be below nominal minimum operating voltage for some devices. For
(2)
Pull-up Resistor
FILTER
SPIKE
(1)
CKSEL[3:0]
Reset Circuit
SUT[1:0]
Brown-Out
Watchdog
Oscillator
Generator
Clock
CK
MCU Control and Status
BODLEVEL = 1
BODLEVEL = 0
BODLEVEL = 1
BODLEVEL = 0
Register (MCUCSR)
Condition
DATA BUS
Delay Counters
Min
0.1
2.4
3.7
TIMEOUT
Typ
130
1.4
1.3
2.6
4.0
2
2
CC
= V
2486M–AVR–12/03
Max
2.3
2.3
0.9
1.5
2.9
4.5
BOT
during the
CC
Units
V
mV
µs
µs
µs
drops
V
V
V
CC
POT