ATmega325PA Atmel Corporation, ATmega325PA Datasheet - Page 48

• Manufacturer Part Number: ATmega325PA
• Manufacturer: Atmel Corporation

11.2.2
8285D–AVR–06/11
External Reset
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
Figure 11-3. MCU Start-up, RESET Extended Externally
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
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
delay counter starts the MCU after the Time-out period – t
Figure 11-4. External Reset During Operation
INTERNAL
TIME-OUT
RESET
RESET
V
CC
CC
V
”System and Reset Characteristics” on page
POT
V
RST
t
TOUT
TOUT
– has expired.
RST
– on its positive edge, the
326) will generate a
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