ATtiny84 datasheet(61/236 Pages) ATMEL

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8006H–AVR–10/09

ATtiny24/44/84

10.2.1

Alternate Functions of Port A

The Port A pins with alternate function are shown in Table 10-3.

• Port A, Bit 0 – ADC0/AREF/PCINT0

• ADC0: Analog to Digital Converter, Channel 0.

• AREF: External Analog Reference for ADC. Pullup and output driver are disabled on PA0

when the pin is used as an external reference or Internal Voltage Reference with external

capacitor at the AREF pin by setting (one) the bit REFS0 in the ADC Multiplexer Selection

•PCINT0: Pin Change Interrupt source 0. The PA0 pin can serve as an external interrupt

source for pin change interrupt 0.

Table 10-3.

Port A Pins Alternate Functions

Port Pin

Alternate Function

PA0

ADC0:

ADC Input Channel 0

AREF:

External Analog Reference

PCINT0: Pin Change Interrupt 0, Source 0

PA1

ADC1:

ADC Input Channel 1

AIN0:

Analog Comparator, Positive Input

PCINT1:Pin Change Interrupt 0, Source 1

PA2

ADC2:

ADC Input Channel 2

AIN1:

Analog Comparator, Negative Input

PCINT2: Pin Change Interrupt 0, Source 2

PA3

ADC3:

ADC Input Channel 3

T0:

Timer/Counter0 Clock Source.

PCINT3: Pin Change Interrupt 0, Source 3

PA4

ADC4:

ADC Input Channel 4

USCK:

USI Clock (Three Wire Mode)

SCL :

USI Clock (Two Wire Mode)

T1:

Timer/Counter1 Clock Source

PCINT4: Pin Change Interrupt 0, Source 4

PA5

ADC5:

ADC Input Channel 5

DO:

USI Data Output (Three Wire Mode)

MISO:

SPI Master Data Input / Slave Data Output

OC1B:

Timer/Counter1 Compare Match B Output

PCINT5: Pin Change Interrupt 0, Source 5

PA6

ADC6:

ADC Input Channel 6

DI:

USI Data Input (Three Wire Mode)

SDA:

USI Data Input (Two Wire Mode)

MOSI:

SPI Master Data Output / Slave Data Input

OC1A:

Timer/Counter1 Compare Match A Output

PCINT6: Pin Change Interrupt 0, Source 6

PA7

ADC7:

ADC Input Channel 7

OC0B:

Timer/Counter0 Compare Match B Output

ICP1:

Timer/Counter1 Input Capture Pin

PCINT7: Pin Change Interrupt 0, Source 7

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