Datasheet

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
TQFP/ QFN/
MLF Pin #
40-pin
PDIP Pin
#
DRQFN Pin# VFBGA Pin# PAD EXTINT PCINT ADC/AC OSC T/C # 0 T/C # 1 USART I2C SPI JTAG
1 6 A1 B2 PB[5] PCINT13 MOSI
2 7 B1 B1 PB[6] PCINT14 MISO
3 8 A2 C3 PB[7] PCINT15 SCK
4 9 B2 C2 RESET
5 10 A3 A5 VCC
6 11 B3 A1 GND
7 12 A4 D2 XTAL2
8 13 B4 E1 XTAL1
9 14 A5 D3 PD[0] PCINT24 RxD0
10 15 B5 E2 PD[1] PCINT25 TxD0
11 16 A6 F1 PD[2] INT0 PCINT26 RxD1
12 17 A7 F2 PD[3] INT1 PCINT27 TXD1
13 18 B6 G2 PD[4] PCINT28 OC1B XCK1
14 19 A8 E3 PD[5] PCINT29 OC1A
15 20 B7 F3 PD[6] PCINT30 OC2B ICP1
16 21 A9 E4 PD[7] PCINT31 OC2A
17 - B8 C1 VCC RxD2 MISO1
18 - A10 A4 GND TxD2 MOSI1
19 22 B9 F4 PC[0] PCINT16 SCL
20 23 A11 G5 PC[1] PCINT17 SDA
21 24 B10 F5 PC[2] PCINT18 TCK
22 25 A12 G6 PC[3] PCINT19 TMS
23 26 A13 F6 PC[4] PCINT20 TDO
24 27 B11 E5 PC[5] PCINT21 TDI
25 28 A14 F7 PC[6] PCINT22 TOSC1
26 29 B12 E6 PC[7] PCINT23 TOSC2
27 30 A15 E7 AVCC
28 31 B13 D1 GND
29 32 A16 C7 AREF AREF
30 33 B14 D6 PA[7] PCINT7 ADC7
31 34 A17 C6 PA[6] PCINT6 ADC6
32 35 B15 B7 PA[5] PCINT5 ADC5
33 36 A18 D5 PA[4] PCINT4 ADC4
Atmel ATmega164A [DATASHEET]
Atmel-42712C-ATmega164A_Datasheet_Summary-10/2016
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