ATtiny87-15XZ datasheet(6/282 Pages) ATMEL

6 / 282 page

7728D–AVR–07/09

ATtiny87/ATtiny167

1.7

Pin Description

1.7.1

Vcc

Supply voltage.

1.7.2

GND

Ground.

1.7.3

AVcc

Analog supply voltage.

1.7.4

AGND

Analog ground.

1.7.5

Port A (PA7..PA0)

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 ATtiny87/167 as listed on

Section 9.3.3 “Alternate Functions of Port A” on page 76.

1.7.6

Port B (PB7..PB0)

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 also serves the functions of various special features of the ATtiny87/167 as listed on

Section 9.3.4 “Alternate Functions of Port B” on page 81.

1.8

Resources

A comprehensive set of development tools, application notes and datasheets are available for

download on http://www.atmel.com/avr.

1.9

About Code Examples

This documentation contains simple code examples that briefly show how to use various parts

of the device. These code examples assume that the part specific header file is included

before compilation. Be aware that not all C compiler vendors include bit definitions in the

header files and interrupt handling in C is compiler dependent. Please confirm with the C com-

piler documentation for more details.

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