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ATmega644PA датащи(PDF) 53 Page - ATMEL Corporation

номер детали ATmega644PA
подробное описание детали  8-bit Microcontroller with 16/32/64/128K Bytes In-Sytem Programmable Flash
PDF  468 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega644PA датащи(HTML) 53 Page - ATMEL Corporation

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53
8152G–AVR–11/09
ATmega164PA/324PA/644PA/1284P
Figure 10-2. MCU Start-up, RESET Tied to V
CC
Figure 10-3. MCU Start-up, RESET Extended Externally
10.1.3
External Reset
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see ”System and Reset Characteristics” on page 334) will generate a
reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset.
When the applied signal reaches the Reset Threshold Voltage – V
RST – on its positive edge, the
delay counter starts the MCU after the Time-out period – t
TOUT – has expired.
Figure 10-4. External Reset During Operation
V
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
CC
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC
CC



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