ATtiny261A datasheet(62/292 Pages) ATMEL

62 / 292 page

8197A–AVR–10/09

ATtiny261A/461A/861A

• Port A, Bit 5 - ADC4/AIN2/PCINT5

• ADC4: Analog to Digital Converter, Channel 4.

• AIN2: Analog Comparator 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.

• PCINT5: Pin Change Interrupt source 5.

• Port A, Bit 4 - ADC3/ICP0/PCINT4

• ADC3: Analog to Digital Converter, Channel 3.

• ICP0: Timer/Counter0 Input Capture Pin.

• PCINT4: Pin Change Interrupt source 4.

• Port A, Bit 3 - AREF/PCINT3

• AREF: External analog reference for ADC. Pullup and output driver are disabled on PA3

when the pin is used as an external reference or internal voltage reference with external

capacitor at the AREF pin.

• PCINT3: Pin Change Interrupt source 3.

• Port A, Bit 2 - ADC2/INT1/USCK/SCL/PCINT2

• ADC2: Analog to Digital Converter, Channel 2.

• INT1: The PA2 pin can serve as an External Interrupt source 1.

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

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

• PCINT2: Pin Change Interrupt source 2.

• Port A, Bit 1 - ADC1/DO/PCINT1

• ADC1: Analog to Digital Converter, Channel 1.

• DO: Three-wire mode Universal Serial Interface Data output. Three-wire mode Data output

overrides PORTA1 value and it is driven to the port when data direction bit DDA1 is set.

PORTA1 still enables the pull-up, if the direction is input and PORTA1 is set.

• PCINT1: Pin Change Interrupt source 1.

• Port A, Bit 0 - ADC0/DI/SDA/PCINT0

• ADC0: Analog to Digital Converter, Channel 0.

• DI: Data Input in USI Three-wire mode. USI Three-wire mode does not override normal port

functions, so pin must be configure as an input for DI function.

• SDA: Two-wire mode Serial Interface Data.

• PCINT0: Pin Change Interrupt source 0.

ATtiny261A Datasheet(PDF) 62 Page - ATMEL Corporation