ATtiny44 datasheet(62/236 Pages) ATMEL

62 / 236 page

8006H–AVR–10/09

ATtiny24/44/84

• Port A, Bit 1 – ADC1/AIN0/PCINT1

• ADC1: Analog to Digital Converter, Channel 1.

•AIN0: Analog Comparator Positive Input. Configure the port pin as input with the internal pull-

up switched off to avoid the digital port function from interfering with the function of the

Analog Comparator.

•PCINT1: Pin Change Interrupt source 1. The PA1 pin can serve as an external interrupt

source for pin change interrupt 0.

• Port A, Bit 2 – ADC2/AIN1/PCINT2

• ADC2: Analog to Digital Converter, Channel 2.

•AIN1: Analog Comparator Negative Input. Configure the port pin as input with the internal

pull-up switched off to avoid the digital port function from interfering with the function of the

Analog Comparator.

•PCINT2: Pin Change Interrupt source 2. The PA2 pin can serve as an external interrupt

source for pin change interrupt 0.

• Port A, Bit 3 – ADC3/T0/PCINT3

• ADC3: Analog to Digital Converter, Channel 3.

• T0: Timer/Counter0 counter source.

•PCINT3: Pin Change Interrupt source 3. The PA3 pin can serve as an external interrupt

source for pin change interrupt 0.

• Port A, Bit 4 – ADC4/USCK/SCL/T1/PCINT4

• ADC4: Analog to Digital Converter, Channel 4.

• USCK: Three-wire mode Universal Serial Interface Clock.

• SCL: Two-wire mode Serial Clock for USI Two-wire mode.

• T1: Timer/Counter1 counter source.

•PCINT4: Pin Change Interrupt source 4. The PA4 pin can serve as an external interrupt

source for pin change interrupt 0.

• Port A, Bit 5 – ADC5/DO/MISO/OC1B/PCINT5

• ADC5: Analog to Digital Converter, Channel 5.

• DO: Data Output in USI Three-wire mode. Data output (DO) overrides PORTA5 value and it

is driven to the port when the data direction bit DDA5 is set (one). However the PORTA5 bit

still controls the pullup, enabling pullup if direction is input and PORTA5 is set(one).

• MISO: Master Data input, Slave Data output pin for SPI channel. When the SPI is enabled as

a Master, this pin is configured as an input regardless of the setting of DDA5. When the SPI is

enabled as a Slave, the data direction of this pin is controlled by DDA5. When the pin is

forced by the SPI to be an input, the pull-up can still be controlled by the PORTA5 bit.

• OC1B: Output Compare Match output: The PA5 pin can serve as an external output for the

Timer/Counter1 Compare Match B. The PA5 pin has to be configured as an output (DDA5 set

(one)) to serve this function. The OC1B pin is also the output pin for the PWM mode timer

function.

•PCINT5: Pin Change Interrupt source 5. The PA5 pin can serve as an external interrupt

source for pin change interrupt 0.

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