ATtiny261-15MZ datasheet(63/227 Pages) ATMEL

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7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

12.3.1

Alternate Functions of Port B

The Port B pins with alternate function are shown in Table 12-3.

The alternate pin configuration is as follows:

• 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 unpro-

grammed, 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.

ADC10: ADC input Channel 10. Note that ADC input channel 10 uses analog power.

PCINT15: Pin Change Interrupt source 15.

• Port B, Bit 6 - ADC9/ T0/ INT0/ PCINT14

ADC9: ADC input Channel 9. Note that ADC input channel 9 uses analog power.

T0: Timer/Counter0 counter source.

INT0: The PB6 pin can serve as an External Interrupt source 0.

PCINT14: Pin Change Interrupt source 14.

• Port B, Bit 5 - XTAL2/ CLKO/ ADC8/ PCINT13

XTAL2: Chip clock Oscillator pin 2. Used as clock pin for crystal Oscillator or Low-frequency

crystal Oscillator. When used as a clock pin, the pin can not be used as an I/O pin.

CLKO: The divided system clock can be output on the PB5 pin, if the CKOUT Fuse is pro-

grammed, regardless of the PORTB5 and DDB5 settings. It will also be output during reset.

OC1D Output Compare Match output: The PB5 pin can serve as an external output for the

Timer/Counter1 Compare Match D when configured as an output (DDA1 set). The OC1D pin is

also the output pin for the PWM mode timer function.

Table 12-3.

Port B Pins Alternate Functions

Port Pin

Alternate Function

PB7

RESET / dW / ADC10 / PCINT15

PB6

ADC9 / T0 / INT0 / PCINT14

PB5

XTAL2 / CLKO / OC1D / ADC8 / PCINT13

PB4

XTAL1 / CLKI / OC1D / ADC7 / PCINT12

PB3

OC1B / PCINT11

PB2

SCK / USCK / SCL / OC1B /PCINT10

PB1

MISO / DO / OC1A / PCINT9

PB0

MOSI / DI / SDA / OC1A / PCINT8

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