8. AVR Pin Assignment Table Sorted by Pin

 Port  Pin  Orangutan Function   Notes/Alternate Functions 
B
PB0 digital I/O Timer1 input capture (ICP1)
divided system clock output (CLK0)
PB1 digital I/O Timer1 PWM output A (OC1A)
PB2 digital I/O Timer1 PWM output B (OC1B)
PB3 M2 control line Timer2 PWM output A (OC2A)
ISP programming line
PB4 digital I/O Caution: also an ISP programming line
PB5 digital I/O Caution: also an ISP programming line
PB6 20 MHz resonator input not accessable to the user
PB7 20 MHz resonator input not accessable to the user
C
PC0 analog input and digital I/O ADC input channel 0 (ADC0)
PC1 analog input and digital I/O ADC input channel 1 (ADC1)
PC2 analog input and digital I/O ADC input channel 2 (ADC2)
PC3 analog input and digital I/O ADC input channel 3 (ADC3)
PC4 analog input and digital I/O ADC input channel 4 (ADC4)
I2C/TWI input/output data line (SDA)
PC5 analog input and digital I/O ADC input channel 5 (ADC5)
I2C/TWI clock line (SCL)
PC6 RESET pin internally pulled high; active low
digital I/O disabled by default
D
PD0 digital I/O USART input pin (RXD)
PD1 digital I/O connected to red user LED (high turns LED on)
USART output pin (TXD)
PD2 digital I/O external interrupt 0 (INT0)
PD3 M2 control line Timer2 PWM output B (OC2B)
PD4 digital I/O USART external clock input/output (XCK)
Timer0 external counter (T0)
PD5 M1 control line Timer0 PWM output B (OC0B)
PD6 M1 control line Timer0 PWM output A (OC0A)
PD7 digital I/O
ADC6

dedicated analog input ADC input channel 6 (ADC6)
ADC7
dedicated analog input connected to user trimmer potentiometer
ADC input channel 7 (ADC7)


This pin assignment table, combined with a pinout diagram, is also available as a downloadable pdf: Baby Orangutan B pinout and pin assignment table (285k pdf).