ATtiny43U datasheet(71/182 Pages) ATMEL

71 / 182 page

8048B–AVR–03/09

• Port A, Bit 4 – AIN0/PCINT4

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.

PCINT4: Pin Change Interrupt source 4. The PA4 pin can serve as an external interrupt source

for pin change interrupt 0.

• Port A, Bit 5 – AIN1/PCINT5

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.

PCINT5: Pin Change Interrupt source 5. The PA5 pin can serve as an external interrupt source

for pin change interrupt 0.

• Port A, Bit 6 – CLKI/PCINT6

CLKI: External Clock Input. When used as a clock pin, the pin can not be used as an I/O pin.

PCINT6: Pin Change Interrupt source 6. The PA6 pin can serve as an external interrupt source

for pin change interrupt 0.

• Port A, Bit 7 – RESET/dW/PCINT7

RESET: External Reset input is active low and enabled by unprogramming (“1”) the RSTDISBL

Fuse. Pullup is activated and output driver and digital input are deactivated when the pin is used

as the RESET pin.

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

grammed, the debugWIRE system within the target device is activated. 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.

PCINT7: Pin Change Interrupt source 7. The PA7 pin can serve as an external interrupt source

for pin change interrupt 0.

ATtiny43U датащи(PDF) 71 Page - ATMEL Corporation