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ATMEGA329P

8-bit Atmel Microcontroller with 32KBytes In-System Programmable Flash

Atmel Corporation 

ATmega329P/3290P

2.3.12 RESET

2.3.13 XTAL1

2.3.14 XTAL2

2.3.15 AVCC

2.3.16 AREF

2.3.17 LCDCAP

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 336. 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 F and the A/D Converter. It should be externally con-

nected 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 A/D Converter.

An external capacitor (typical > 470nF) must be connected to the LCDCAP pin as shown in Fig-

ure 23-2, if the LCD module is enabled and configured to use internal power. This capacitor acts

as a reservoir for LCD power (VLCD). A large capacitance reduces ripple on VLCD but increases

the time until VLCD reaches its target value.

8

8021HS–AVR–07/2015

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