ATMEGA169PA-MCUR View Datasheet(PDF) - Atmel Corporation

Part Name

Description

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ATMEGA169PA-MCUR

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

Atmel Corporation 

ATmega169PA

2.2 Pin Descriptions

2.2.1 VCC

2.2.2 GND

Digital supply voltage.

2.2.3

Ground.

Port A (PA7:PA0)

2.2.4

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

Port A output buffers 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 ATmega169PA as listed on

”Alternate Functions of Port A” on page 72.

Port B (PB7:PB0)

2.2.5

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

Port B output buffers 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 ATmega169PA as listed on

”Alternate Functions of Port B” on page 73.

Port C (PC7:PC0)

2.2.6

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

Port C output buffers 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 ATmega169PA as listed on ”Alternate

Functions of Port C” on page 76.

Port D (PD7:PD0)

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

Port D output buffers 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 ATmega169PA as listed on

”Alternate Functions of Port D” on page 78.

6

8171B–AVR–03/10

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