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ATmega169P Datasheet(PDF) 49 Page - ATMEL Corporation

Part # ATmega169P
Description  8-bit Microcontroller with 16K Bytes In-System Programmable Flash
PDF  393 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega169P Datasheet(HTML) 49 Page - ATMEL Corporation

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49
8018N–AVR–08/09
ATmega169P
Figure 10-3. MCU Start-up, RESET Extended Externally
10.2.2
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 331) 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
RESET
TIME-OUT
INTERNAL
RESET
t
TOUT
V
POT
V
RST
VCC
CC



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