Alternate Functions of Port A

The Port A pins with alternate functions are shown in the table below:

Table 1. Port A Pins Alternate Functions
Port Pin Alternate Functions
PA7

ADC7 (ADC input channel 7)
PCINT7 (Pin Change Interrupt 7)

PA6

ADC6 (ADC input channel 6)
PCINT6 (Pin Change Interrupt 6)

PA5

ADC5 (ADC input channel 5)
PCINT5 (Pin Change Interrupt 5)

PA4

ADC4 (ADC input channel 4)
PCINT4 (Pin Change Interrupt 4)

PA3

ADC3 (ADC input channel 3)
PCINT3 (Pin Change Interrupt 3)

PA2

ADC2 (ADC input channel 2)
PCINT2 (Pin Change Interrupt 2)

PA1

ADC1 (ADC input channel 1)
PCINT1 (Pin Change Interrupt 1)

PA0

ADC0 (ADC input channel 0)
PCINT0 (Pin Change Interrupt 0)

The alternate pin configuration is as follows:
Table 2. Overriding Signals for Alternate Functions in PA7...PA4
Signal
Name PA7/ADC7/ PCINT7 PA6/ADC6/ PCINT6 PA5/ADC5/ PCINT5 PA4/ADC4/ PCINT4
PUOE 0 0 0 0
PUOV 0 0 0 0
DDOE 0 0 0 0
DDOV 0 0 0 0
PVOE 0 0 0 0
PVOV 0 0 0 0
DIEOE PCINT7 • PCIE0 + ADC7D PCINT6 • PCIE0 + ADC6D PCINT5 • PCIE0 + ADC5D PCINT4 • PCIE0 + ADC4D
DIEOV PCINT7 • PCIE0 PCINT6 • PCIE0 PCINT5 • PCIE0 PCINT4 • PCIE0
DI PCINT7 INPUT PCINT6 INPUT PCINT5 INPUT PCINT4 INPUT
AIO ADC7 INPUT ADC6 INPUT ADC5 INPUT ADC4 INPUT
Table 3. Overriding Signals for Alternate Functions in PA3...PA0
Signal
Name PA3/ADC3/ PCINT3 PA2/ADC2/ PCINT2 PA1/ADC1/ PCINT1 PA0/ADC0/ PCINT0
PUOE 0 0 0 0
PUOV 0 0 0 0
DDOE 0 0 0 0
DDOV 0 0 0 0
PVOE 0 0 0 0
PVOV 0 0 0 0
DIEOE PCINT3 • PCIE0 + ADC3D PCINT2 • PCIE0 + ADC2D PCINT1 • PCIE0 + ADC1D PCINT0 • PCIE0 + ADC0D
DIEOV PCINT3 • PCIE0 PCINT2 • PCIE0 PCINT1 • PCIE0 PCINT0 • PCIE0
DI PCINT3 INPUT PCINT2 INPUT PCINT1 INPUT PCINT0 INPUT
AIO ADC3 INPUT ADC2 INPUT ADC1 INPUT ADC0 INPUT