ATMEGA32 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'ATMEGA32' PDF : 346 Pages View PDF
2503J–AVR–10/06
ATmega32(L)
Figure 15. Reset Logic
DATA BUS
MCU Control and Status
Register (MCUCSR)
Power-on
Reset Circuit
BODEN
BODLEVEL
Pull-up Resistor
SPIKE
FILTER
Brown-out
Reset Circuit
Reset Circuit
JTAG Reset
Register
Watchdog
Timer
Watchdog
Oscillator
Clock
CK
Generator
Delay Counters
TIMEOUT
CKSEL[3:0]
SUT[1:0]
Table 15. Reset Characteristics
Symbol Parameter
Condition
Min Typ Max Units
VPOT
Power-on Reset
Threshold Voltage (rising)
Power-on Reset
Threshold Voltage
(falling)(1)
1.4
2.3
V
1.3
2.3
V
VRST
RESET Pin Threshold
Voltage
0.2 VCC
0.9VCC
V
tRST
Minimum pulse width on
RESET Pin
1.5
µs
VBOT
Brown-out Reset
Threshold Voltage(2)
BODLEVEL = 1 2.5
2.7
2.9
V
BODLEVEL = 0 3.6
4.0
4.2
Minimum low voltage
BODLEVEL = 1
2
µs
tBOD
period for Brown-out
Detection
BODLEVEL = 0
2
µs
VHYST
Brown-out Detector
hysteresis
50
mV
Notes:
1. The Power-on Reset will not work unless the supply voltage has been below VPOT
(falling).
2. VBOT may be below nominal minimum operating voltage for some devices. For
devices where this is the case, the device is tested down to VCC = VBOT during the
production test. This guarantees that a Brown-out Reset will occur before VCC drops
to a voltage where correct operation of the microcontroller is no longer guaranteed.
The test is performed using BODLEVEL = 1 for ATmega32L and BODLEVEL = 0 for
ATmega32. BODLEVEL = 1 is not applicable for ATmega32.
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