ATtiny43U datasheet(75/182 Pages) ATMEL

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8048B–AVR–03/09

PCINT10: Pin Change Interrupt source 10. The PB2 pin can serve as an external interrupt

source for pin change interrupt 1.

• Port B, Bit 3 – T1/CLKO/PCINT11

T1: Timer/Counter1 Counter source.

CLKO: System Clock Output. The system clock can be output on the PB3 pin. The system clock

will be output if the CKOUT Fuse is programmed, regardless of the PORTB3 and DDB3 settings.

It will also be output during reset.

PCINT11: Pin Change Interrupt source 11. The PB3 pin can serve as an external interrupt

source for pin change interrupt 1.

• Port B, Bit 4 – DI/SDA/OC1A/PCINT12

DI: Data Input in USI Three-wire mode. USI Three-wire mode does not override normal port

functions, so pin must be configure as an input for DI function.

SDA: Two-wire mode Serial Interface Data.

OC1A, Output Compare Match output: The PB4 pin can serve as an external output for the

Timer/Counter1 Compare Match A. The PB4 pin has to be configured as an output (DDB4 set

(one)) to serve this function. The OC1A pin is also the output pin for the PWM mode timer

function.

PCINT12: Pin Change Interrupt source 12. The PB4 pin can serve as an external interrupt

source for pin change interrupt 1.

• Port B, Bit 5 – DO/OC1B/PCINT13

DO: Data Output in USI Three-wire mode. Data output (DO) overrides PORTB5 value and it is

driven to the port when the data direction bit DDB5 is set (one). However the PORTB5 bit still

controls the pullup, enabling pullup if direction is input and PORTB5 is set (one).

OC1B: Output Compare Match output: The PB5 pin can serve as an external output for the

Timer/Counter1 Compare Match B. The PB5 pin has to be configured as an output (DDB5 set

(one)) to serve this function. The OC1B pin is also the output pin for the PWM mode timer

function.

PCINT13: Pin Change Interrupt source 13. The PB5 pin can serve as an external interrupt

source for pin change interrupt 1.

• Port B, Bit 6 – USCK/SCL/PCINT14

USCK: Three-wire mode Universal Serial Interface Clock.

SCL: Two-wire mode Serial Clock for USI Two-wire mode.

PCINT14: Pin Change Interrupt source 14. The PB6 pin can serve as an external interrupt

source for pin change interrupt 1.

• Port B, Bit 7 – INT0/PCINT15

INT0: External Interrupt Request 0.

PCINT15: Pin Change Interrupt source 15. The PB7 pin can serve as an external interrupt

source for pin change interrupt 1.

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