AIN1, Analog Comparator Negative Input. Configure the port pin as input with the inter-
nal pull-up switched off to avoid the digital port function from interfering with the function
of the Analog Comparator.
PCINT23: Pin Change Interrupt source 23. The PD7 pin can serve as an external inter-
rupt source.
• AIN0/OC0A/PCINT22 – Port D, Bit 6
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 PD6 pin can serve as an external output for
the Timer/Counter0 Compare Match A. The PD6 pin has to be configured as an output
(DDD6 set (one)) to serve this function. The OC0A pin is also the output pin for the
PWM mode timer function.
PCINT22: Pin Change Interrupt source 22. The PD6 pin can serve as an external inter-
rupt source.
• T1/OC0B/PCINT21 – Port D, Bit 5
T1, Timer/Counter1 counter source.
OC0B, Output Compare Match output: The PD5 pin can serve as an external output for
the Timer/Counter0 Compare Match B. The PD5 pin has to be configured as an output
(DDD5 set (one)) to serve this function. The OC0B pin is also the output pin for the
PWM mode timer function.
PCINT21: Pin Change Interrupt source 21. The PD5 pin can serve as an external inter-
rupt source.
• XCK/T0/PCINT20 – Port D, Bit 4
XCK, USART external clock.
T0, Timer/Counter0 counter source.
PCINT20: Pin Change Interrupt source 20. The PD4 pin can serve as an external inter-
rupt source.
• INT1/OC2B/PCINT19 – Port D, Bit 3
INT1, External Interrupt source 1: The PD3 pin can serve as an external interrupt
source.
OC2B, Output Compare Match output: The PD3 pin can serve as an external output for
the Timer/Counter0 Compare Match B. The PD3 pin has to be configured as an output
(DDD3 set (one)) to serve this function. The OC2B pin is also the output pin for the
PWM mode timer function.
PCINT19: Pin Change Interrupt source 19. The PD3 pin can serve as an external inter-
rupt source.
• INT0/PCINT18 – Port D, Bit 2
INT0, External Interrupt source 0: The PD2 pin can serve as an external interrupt
source.
PCINT18: Pin Change Interrupt source 18. The PD2 pin can serve as an external inter-
rupt source.
76
ATmega48/88/168
2545D–AVR–07/04
ATMEL [ ATMEL ]
