ATtiny44 datasheet(3/26 Pages) ATMEL

3 / 26 page

8006HS–AVR–10/09

ATtiny24/44/84

Port B also serves the functions of various special features of the ATtiny24/44/84 as listed in

Section 10.2 “Alternate Port Functions” on page 58.

1.1.4

RESET

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 and provided the reset pin has not been disabled. The min-

imum pulse length is given in Table 20-4 on page 177. Shorter pulses are not guaranteed to

generate a reset.

The reset pin can also be used as a (weak) I/O pin.

1.1.5

Port A (PA7...PA0)

Port A is a 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 has alternate functions as analog inputs for the ADC, analog comparator, timer/counter,

SPI and pin change interrupt as described in “Alternate Port Functions” on page 58.

ATtiny44 Datasheet(PDF) 3 Page - ATMEL Corporation