2

8127CS–AVR–10/09

ATtiny4/5/9/10

1. Pin Configurations

Figure 1-1.

Pinout of ATtiny4/5/9/10

1.1

Pin Description

1.1.1

VCC

Supply voltage.

1.1.2

GND

Ground.

1.1.3

Port B (PB3..PB0)

This is a 4-bit, bi-directional I/O port with internal pull-up resistors, individually selectable for

each bit. The output buffers have symmetrical drive characteristics, with both high sink and

source capability. As inputs, the port pins that are externally pulled low will source current if pull-

up resistors are activated. Port pins are tri-stated when a reset condition becomes active, even if

the clock is not running.

The port also serves the functions of various special features of the ATtiny4/5/9/10, as listed on

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-

generate a reset.

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

1

2

3

6

5

4

(PCINT0/TPIDATA/OC0A/ADC0/AIN0) PB0

GND

(PCINT1/TPICLK/CLKI/ICP0/OC0B/ADC1/AIN1) PB1

PB3 (RESET/PCINT3/ADC3)

VCC

PB2 (T0/CLKO/PCINT2/INT0/ADC2)

SOT-23