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ATmega644PA Datasheet(PDF) 334 Page - ATMEL Corporation

Part # ATmega644PA
Description  8-bit Microcontroller with 16/32/64/128K Bytes In-Sytem Programmable Flash
PDF  468 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega644PA Datasheet(HTML) 334 Page - ATMEL Corporation

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334
8152G–AVR–11/09
ATmega164PA/324PA/644PA/1284P
27.4
System and Reset Characteristics
Notes:
1. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling).
Note:
1. V
BOT 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 = 101 and BODLEVEL = 110 for ATmega164PA/324PA.
27.5
External Interrupts Characteristics
Table 27-8.
Reset, Brown-out and Internal Voltage Reference Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
VPOT
Power-on Reset Threshold Voltage (rising)
1.1
1.4
1.6
V
Power-on Reset Threshold Voltage (falling)
(1)
0.6
1.3
1.6
V
VRST
RESET Pin Threshold Voltage
0.2VCC
0.9VCC
V
tRST
Minimum pulse width on RESET Pin
2.5
µs
V
HYST
Brown-out Detector Hysteresis
50
mV
tBOD
Min Pulse Width on Brown-out Reset
2
µs
VBG
Bandgap reference voltage
VCC= 2.7V, TA = 25°C1.0
1.1
1.2
V
tBG
Bandgap reference start-up time
V
CC= 2.7V, TA = 25°C40
70
µs
IBG
Bandgap reference current consumption
VCC= 2.7V, TA = 25°C10
µA
Table 27-9.
BODLEVEL Fuse Coding(1)
BODLEVEL 2:0 Fuses
Min V
BOT
Typ V
BOT
Max V
BOT
Units
111
BOD Disabled
110
1.7
1.8
2.0
V
101
2.5
2.7
2.9
100
4.1
4.3
4.5
011
Reserved
010
001
000
Table 27-10. Asynchronous External Interrupt Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
tINT
Minimum pulse width for asynchronous external interrupt
50
ns



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