ATtiny261-ESSZ datasheet(67/227 Pages) ATMEL

67 / 227 page

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

• Port A, Bit 6 - ADC5/AIN1/PCINT6

ADC5: Analog to Digital Converter, Channel 5.

AIN1: 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.

PCINT6: Pin Change Interrupt source 6.

• 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. Pull-up 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 over-

rides 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.

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