ATMEGA128-16AU datasheet(7/386 Pages) ATMEL

Part #	ATMEGA128-16AU

Description	8-bit Microcontroller with 128K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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7 / 386 page

7

2467R–AVR–06/08

ATmega128

RESET

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 Table 19 on page

51. Shorter pulses are not guaranteed to generate a reset.

XTAL1

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

XTAL2

Output from the inverting Oscillator amplifier.

AVCC

AVCC is the supply voltage pin for Port F and the A/D Converter. It should be externally con-

nected to V

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

through a low-pass filter.

AREF

AREF is the analog reference pin for the A/D Converter.

PEN

PEN is a programming enable pin for the SPI Serial Programming mode, and is internally pulled

high . By holding this pin low during a Power-on Reset, the device will enter the SPI Serial Pro-

gramming mode. PEN has no function during normal operation.

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