ATMEGA645A Ver la hoja de datos (PDF) - Atmel Corporation

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ATMEGA645A

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

Atmel Corporation 

ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P

2.3.10

2.3.11

2.3.12

2.3.13

2.3.14

2.3.15

2.3.16

Port G also serves the functions of various special features of the

ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P as listed on page

84.

Port H (PH7:PH0)

Port H is a 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port H output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port H pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port H pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Port H also serves the functions of various special features of the

ATmega3250A/3250PA/6450A/6450P as listed on page 85.

Port J (PJ6:PJ0)

RESET

Port J is a 7-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port J output buffers have symmetrical drive characteristics with both high sink and source capa-

bility. As inputs, Port J pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port J pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Port J also serves the functions of various special features of the

ATmega3250A/3250PA/6450A/6450P as listed on page 87.

XTAL1

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 27-13 on page

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

XTAL2

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

AVCC

Output from the inverting Oscillator amplifier.

AREF

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.

8

8285AS–AVR–10/10

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