Table 1-1.
Pin
Pin Description
Symbol
Function
PB0
PCINT8
OC1AU
DI
GPIO Port B – Pin 0
PCINT8 (Pin Change Interrupt 8)
OC1AU (Output Compare and PWM Output A-U for Timer/Counter 1)
DI (Three-wire Mode USI Default Data Input)
SDA (Two-wire Mode USI Default Data Input / Output)
28
29
30
SDA
PA0
PCINT0
ADC0
RXD
GPIO Port A – Pin 0
PCINT0 (Pin Change Interrupt 0)
ADC0 (ADC Input Channel 0)
RXD (UART Receive Pin)
RXLIN (LIN Receive Pin)
RXLIN
PA1
PCINT1
ADC1
TXD
GPIO Port A – Pin 1
PCINT1 (Pin Change Interrupt 1)
ADC1 (ADC Input Channel 1)
TXD (UART Transmit Pin)
TXLIN (LIN Transmit Pin)
TXLIN
31
32
33
GND
GND
GND
Ground
Ground
Ground
PA2
PCINT2
ADC2
OCA0A
DO
GPIO Port A – Pin 2
PCINT2 (Pin Change Interrupt 2)
ADC2 (ADC Input Channel 2)
OC0A (Output Compare and PWM Output A for Timer/Counter 0)
DO (Three-wire Mode USI Alternate Data Output)
MISO (SPI Master Input/Slave Output)
34
MISO
PA3
PCINT3
ADC3
ISRC
GPIO Port A – Pin 3
PCINT3 (Pin Change Interrupt 3)
ADC3 (ADC Input Channel 3)
ISRC (Current Source Pin)
INT1 (External Interrupt1 Input)
35
INT1
36
37
AVCC
AGND
Analog Supply Voltage
Analog Ground
PA4
PCINT4
ADC4
ICP1
DI
GPIO Port A – Pin 4
PCINT4 (Pin Change Interrupt 4)
ADC4 (ADC Input Channel 4)
ICP1 (Timer/Counter 1 Input Capture Trigger)
DI (Three-wire Mode USI Alternate Data Input)
SDA (Two-wire Mode USI Alternate Data Input/Output)
MOSI (SPI Master Output/Slave Input)
38
SDA
MOSI
8
Atmel ATA5505 [Preliminary]
9219A–RFID–01/11