5

7728AS–AUTO–07/08

ATtiny167

1.6.2

GND

Ground.

1.6.3

AVcc

Analog supply voltage.

1.6.4

AGND

Analog ground.

1.6.5

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 ATtiny167 as listed on Section

9.3.3 ”Alternate Functions of Port A” on page 73.

1.6.6

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 ATtiny167 as listed on Section

9.3.4 ”Alternate Functions of Port B” on page 78.

1.7

Resources

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

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

1.8

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 compiler documen-

tation for more details.