2

8183AS–AVR–12/08

ATtiny24A/44A

1.

Pin Configurations

Figure 1-1.

Pinout of ATtiny24A/44A

1.1

Pin Descriptions

1.1.1

VCC

Supply voltage.

1.1.2

GND

Ground.

1.1.3

Port B (PB3...PB0)

Port B is a 4-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 except PB3 which has the RESET capability. To use pin PB3 as an I/O pin, instead of

RESET pin, program (‘0’) RSTDISBL fuse. 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.

1

2

3

4

5

6

7

14

13

12

11

10

9

8

VCC

(PCINT8/XTAL1/CLKI) PB0

(PCINT9/XTAL2) PB1

(PCINT11/RESET/dW) PB3

(PCINT10/INT0/OC0A/CKOUT) PB2

(PCINT7/ICP/OC0B/ADC7) PA7

(PCINT6/OC1A/SDA/MOSI/DI/ADC6) PA6

GND

PA0 (ADC0/AREF/PCINT0)

PA1 (ADC1/AIN0/PCINT1)

PA2 (ADC2/AIN1/PCINT2)

PA3 (ADC3/T0/PCINT3)

PA4 (ADC4/USCK/SCL/T1/PCINT4)

PA5 (ADC5/DO/MISO/OC1B/PCINT5)

PDIP/SOIC

1

2

3

4

5

QFN/MLF

15

14

13

12

11

NOTE

Bottom pad should be

soldered to ground.

DNC: Do Not Connect

PA7 (PCINT7/ICP/OC0B/ADC7)

PB2 (PCINT10/INT0/OC0A/CKOUT)

PB3 (PCINT11/RESET/dW)

PB1 (PCINT9/XTAL2)

PB0 (PCINT8/XTAL1/CLKI)

Pin 16: PA6 (PCINT6/OC1A/SDA/MOSI/DI/ADC6)

Pin 20: PA5 (ADC5/DO/MISO/OC1B/PCINT5)

(ADC4/USCK/SCL/T1/PCINT4) PA4

(ADC3/T0/PCINT3) PA3

(ADC2/AIN1/PCINT2) PA2

(ADC1/AIN0/PCINT1) PA1

(ADC0/AREF/PCINT0) PA0