ATtiny261A datasheet(64/292 Pages) ATMEL

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8197A–AVR–10/09

ATtiny261A/461A/861A

10.2.2

Alternate Functions of Port B

The Port B pins with alternate function are shown in Table 10-6.

• Port B, Bit 7 - RESET/ dW/ ADC10/ PCINT15

• RESET, Reset pin: When the RSTDISBL Fuse is programmed, this pin functions as a normal

I/O pin, and the part will have to rely on Power-on Reset and Brown-out Reset as its reset

sources. When the RSTDISBL Fuse is unprogrammed, the reset circuitry is connected to the

pin, and the pin can not be used as an I/O pin.

• If PB7 is used as a reset pin, DDB7, PORTB7 and PINB7 will all read 0.

• dW: When the debugWIRE Enable (DWEN) Fuse is programmed and Lock bits are

unprogrammed, the RESET port pin is configured as a wire-AND (open-drain) bi-directional

I/O pin with pull-up enabled and becomes the communication gateway between target and

emulator.

Table 10-6.

Port B Pins Alternate Functions

Port Pin

Alternate Function

PB7

RESET: Reset pin

dW:

debugWire I/O

ADC10: ADC Input Channel 10

PCINT15:Pin Change Interrupt 0, Source 15

PB6

ADC9: ADC Input Channel 9

T0:

Timer/Counter0 Clock Source

INT0:

External Interrupt 0 Input

PCINT14:Pin Change Interrupt 0, Source 14

PB5

XTAL2: Crystal Oscillator Output

CLKO: System Clock Output

OC1D: Timer/Counter1 Compare Match D Output

ADC8: ADC Input Channel 8

PCINT13:Pin Change Interrupt 0, Source 13

PB4

XTAL1: Crystal Oscillator Input

CLKI:

External Clock Input

OC1D: Inverted Timer/Counter1 Compare Match D Output

ADC7: ADC Input Channel 7

PCINT12:Pin Change Interrupt 0, Source 12

PB3

OC1B: Timer/Counter1 Compare Match B Output

PCINT11:Pin Change Interrupt 0, Source 11

PB2

USCK: USI Clock (Three Wire Mode)

SCL :

USI Clock (Two Wire Mode)

OC1B: Inverted Timer/Counter1 Compare Match B Output

PCINT10:Pin Change Interrupt 0, Source 10

PB1

DO:

USI Data Output (Three Wire Mode)

OC1A: Timer/Counter1 Compare Match A Output

PCINT9: Pin Change Interrupt 1, Source 9

PB0

DI:

USI Data Input (Three Wire Mode)

SDA:

USI Data Input (Two Wire Mode)

OC1A: Inverted Timer/Counter1 Compare Match A Output

PCINT8: Pin Change Interrupt 1, Source 8

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