ATtiny5 datasheet(48/168 Pages) ATMEL

48 / 168 page

8127C–AVR–10/09

ATtiny4/5/9/10

10.3.1

Alternate Functions of Port B

The Port B pins with alternate function are shown in Table 10-3 on page 48.

• Port B, Bit 0 – ADC0/AIN0/OC0A/PCINT0/TPIDATA

• ADC0: Analog to Digital Converter, Channel 0 (ATtiny5/10, only)

• 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.

• OC0A, Output Compare Match output: The PB0 pin can serve as an external output for the

Timer/Counter0 Compare Match A. The pin has to be configured as an output (DDB0 set

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

• PCINT0: Pin Change Interrupt source 0. The PB0 pin can serve as an external interrupt

source for pin change interrupt 0.

• TPIDATA: Serial Programming Data.

• Port B, Bit 1 – ADC1/AIN1/CLKI/ICP0/OC0B/PCINT1/TPICLK

• ADC1: Analog to Digital Converter, Channel 1 (ATtiny5/10, only)

• 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.

• CLKI: External Clock.

• ICP0: Input Capture Pin. The PB1 pin can act as an Input Capture pin for Timer/Counter0.

Table 10-3.

Port B Pins Alternate Functions

Port Pin

Alternate Function

PB0

ADC0: ADC Input Channel 0

AIN0:

Analog Comparator, Positive Input

OC0A: Timer/Counter0 Compare Match A Output

PCINT0: Pin Change Interrupt 0, Source 0

TPIDATA:Serial Programming Data

PB1

ADC1: ADC Input Channel 1

AIN1:

Analog Comparator, Negative Input

CLKI:

External Clock

ICP0:

Timer/Counter0 Input Capture Input

OC0B: Timer/Counter0 Compare Match B Output

PCINT1:Pin Change Interrupt 0, Source 1

TPICLK: Serial Programming Clock

PB2

ADC2: ADC Input Channel 2

CLKO: System Clock Output

INT0:

External Interrupt 0 Source

PCINT2: Pin Change Interrupt 0, Source 2

T0:

Timer/Counter0 Clock Source

PB3

ADC3: ADC Input Channel 3

PCINT3: Pin Change Interrupt 0, Source 3

RESET: Reset Pin

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