6. I/O Multiplexing
Each pin is by default controlled by the PORT as a general purpose I/O and alternatively it can be
assigned to one of the peripheral functions.
The following table describes the peripheral signals multiplexed to the PORT I/O pins.
Table 6-1. PORT Function Multiplexing
(32-pin
32UFBGA)
Pin#
(32-pin
MLF/
TQFP)
Pin#
(28-pin
MLF)
Pin#
(28-pin
PIPD)
Pin#
PAD EXTINT PCINT ADC/A
C
OSC T/C #0 T/C
#1
USART
0
I2C 0 SPI 0
B1 1 1 5 PD[3] INT1 PCINT19 OC2B
B2 2 2 6 PD[4] PCINT20 T0 XCK0
D1 4 3 7 VCC
C1 3 4 8 GND
D2 6 - - VCC
C2 5 - - GND
E1 7 5 9 PB[6] PCINT6 XTAL1/
TOSC1
F1 8 6 10 PB[7] PCINT7 XTAL2/
TOSC2
F2 9 7 11 PD[5] PCINT21 OC0B T1
E2 10 8 12 PD[6] PCINT22 AIN0 OC0A
F3 11 9 13 PD[7] PCINT23 AIN1
E3 12 10 14 PB[0] PCINT0 CLKO ICP1
F4 13 11 15 PB[1] PCINT1 OC1A
E4 14 12 16 PB[2] PCINT2 OC1B SS0
F5 15 13 17 PB[3] PCINT3 OC2A MOSI0
F6 16 14 18 PB[4] PCINT4 MISO0
E6 17 15 19 PB[5] PCINT5 SCK0
E5 18 16 20 AVCC
D6 19 - - ADC6 ADC6
D5 20 17 21 AREF
C6 21 18 22 GND
C5 22 - - ADC7 ADC7
B6 23 19 13 PC[0] PCINT8 ADC0
A6 24 20 24 PC[1] PCINT9 ADC1
A2 25 21 25 PC[2] PCINT10 ADC2
B5 26 22 26 PC[3] PCINT11 ADC3
A4 27 23 27 PC[4] PCINT12 ADC4 SDA0
B4 28 24 28 PC[5] PCINT13 ADC5 SCL0
Atmel ATmega48PA/88PA/168PA [DATASHEET]
Atmel-42734B-ATmega48PA/88PA/168PA_Datasheet_Summary-11/2016
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