ATMEGA329PA 데이터 시트보기 (PDF) - Atmel Corporation

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ATMEGA329PA

8-bit Atmel Microcontroller with 16/32/64KB In-System Programmable Flash

Atmel Corporation 

2.3 Pin descriptions

2.3.1

2.3.2

The following section describes the I/O-pin special functions.

VCC

Digital supply voltage.

GND

Ground.

2.3.3 Port A (PA7...PA0)

2.3.4

Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port A output buf-

fers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port A pins that are

externally pulled low will source current if the pull-up resistors are activated. The Port A pins are tri-stated when a

reset condition becomes active, even if the clock is not running.

Port A also serves the functions of various special features of the Atmel

ATmega169A/169PA/329A/329PA/3290A/3290PA/649A/649P/6490A/6490P as listed on page 73.

Port B (PB7...PB0)

2.3.5

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B output buf-

fers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port B pins that are

externally pulled low will source current if the pull-up resistors are activated. The Port B pins are tri-stated when a

reset condition becomes active, even if the clock is not running.

Port B has better driving capabilities than the other ports.

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

ATmega169A/169PA/329A/329PA/3290A/3290PA/649A/649P/6490A/6490P as listed on page 74.

Port C (PC7...PC0)

2.3.6

Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C output buf-

fers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins that are

externally pulled low will source current if the pull-up resistors are activated. The Port C pins are tri-stated when a

reset condition becomes active, even if the clock is not running.

Port C also serves the functions of special features of the

ATmega169A/169PA/329A/329PA/3290A/3290PA/649A/649P/6490A/6490P as listed on page 77.

Port D (PD7...PD0)

2.3.7

Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port D output buf-

fers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port D pins that are

externally pulled low will source current if the pull-up resistors are activated. The Port D pins are tri-stated when a

reset condition becomes active, even if the clock is not running.

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

ATmega169A/169PA/329A/329PA/3290A/3290PA/649A/649P/6490A/6490P as listed on page 78.

Port E (PE7...PE0)

Port E is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port E output buf-

fers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port E pins that are

externally pulled low will source current if the pull-up resistors are activated. The Port E pins are tri-stated when a

reset condition becomes active, even if the clock is not running.

ATmega169A/PA/329A/PA/649A/P/3290A/PA/6490A/P [SUMMARY]

8

8284ES–AVR–02/2013

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