ATMEGA644P View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA644P

8-bit Microcontroller with 16K/32K/64K Bytes In-System Programmable Flash

Atmel Corporation 

2.3.7 RESET

2.3.8 XTAL1

2.3.9 XTAL2

2.3.10 AVCC

2.3.11 AREF

ATmega164P/324P/644P

Reset input. A low level on this pin for longer than the minimum pulse length will generate a

reset, even if the clock is not running. The minimum pulse length is given in ”System and Reset

Characteristics” on page 332. Shorter pulses are not guaranteed to generate a reset.

Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.

Output from the inverting Oscillator amplifier.

AVCC is the supply voltage pin for Port A and the Analog-to-digital Converter. It should be exter-

nally connected to VCC, even if the ADC is not used. If the ADC is used, it should be connected

to VCC through a low-pass filter.

This is the analog reference pin for the Analog-to-digital Converter.

7

8011OS–AVR–07/10

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