Notes: 1. INTRC means that one of the internal RC Oscillators are selected (by the CKSEL fuses),
EXTCK means that external clock is selected (by the CKSEL fuses).
Table 13-5. Overriding Signals for Alternate Functions in PB3..PB0
Signal
Name
PB3/MOSI/
OC2/PCINT3
PB2/SS/
OC1B/PCINT2
PB1/OC1A/
PCINT1
PB0/ICP1/
PCINT0
PUOE
PUOV
DDOE
DDOV
SPE • MSTR
PORTB3 • PUD
SPE • MSTR
0
SPE • MSTR
PORTB2 • PUD
SPE • MSTR
0
0
0
0
0
0
0
0
0
SPE • MSTR +
OC2A ENABLE
PVOE
PVOV
OC1B ENABLE
OC1B
OC1A ENABLE
OC1A
0
0
SPI MSTR OUTPUT
+ OC2A
DIEOE
DIEOV
PCINT3 • PCIE0
1
PCINT2 • PCIE0
1
PCINT1 • PCIE0
1
PCINT0 • PCIE0
1
PCINT3 INPUT
PCINT2 INPUT
SPI SS
PCINT0 INPUT
ICP1 INPUT
DI
PCINT1 INPUT
–
SPI SLAVE INPUT
AIO
–
–
–
13.3.2
Alternate Functions of Port C
The Port C pins with alternate functions are shown in Table 13-6.
Table 13-6. Port C Pins Alternate Functions
Port Pin
Alternate Function
RESET (Reset pin)
PCINT14 (Pin Change Interrupt 14)
PC6
ADC5 (ADC Input Channel 5)
PC5
PC4
SCL (2-wire Serial Bus Clock Line)
PCINT13 (Pin Change Interrupt 13)
ADC4 (ADC Input Channel 4)
SDA (2-wire Serial Bus Data Input/Output Line)
PCINT12 (Pin Change Interrupt 12)
ADC3 (ADC Input Channel 3)
PCINT11 (Pin Change Interrupt 11)
PC3
PC2
PC1
PC0
ADC2 (ADC Input Channel 2)
PCINT10 (Pin Change Interrupt 10)
ADC1 (ADC Input Channel 1)
PCINT9 (Pin Change Interrupt 9)
ADC0 (ADC Input Channel 0)
PCINT8 (Pin Change Interrupt 8)
The alternate pin configuration is as follows:
• RESET/PCINT14 – Port C, Bit 6
82
ATmega48/88/168
2545M–AVR–09/07
ATMEL [ ATMEL ]
