Datasheet

1. INTRC means that the internal RC Oscillator is selected (by the CKSEL Fuse).
2. EXT means that the external RC Oscillator or an external clock is selected (by the CKSEL Fuse).
Table 18-5. Overriding Signals for Alternate Functions in PB3:PB0
Signal
Name
PB3/MOSI/
OC2
PB2/SS/
OC1B
PB1/OC1A PB0/ICP1
PUOE SPE • MSTR SPE • MSTR 0 0
PUO PORTB3 • PUD PORTB2 • PUD 0 0
DDOE SPE • MSTR SPE • MSTR 0 0
DDOV 0 0 0 0
PVOE SPE • MSTR + OC2 ENABLE OC1B ENABLE OC1A ENABLE 0
PVOV SPI MSTR OUTPUT + OC2 OC1B OC1A 0
DIEOE 0 0 0 0
DIEOV 0 0 0 0
DI SPI SLAVE INPUT SPI SS – ICP1 INPUT
AIO – – – –
18.3.2 Alternate Functions of Port C
The Port C pins with alternate functions are shown in the table below:
Table 18-6. Port C Pins Alternate Functions
Port Pin Alternate Function
PC6 RESET (Reset pin)
PC5 ADC5 (ADC Input Channel 5)
SCL (Two-wire Serial Bus Clock Line)
PC4 ADC4 (ADC Input Channel 4)
SDA (Two-wire Serial Bus Data Input/Output Line)
PC3 ADC3 (ADC Input Channel 3)
PC2 ADC2 (ADC Input Channel 2)
PC1 ADC1 (ADC Input Channel 1)
PC0 ADC0 (ADC Input Channel 0)
The alternate pin configuration is as follows:
• RESET – Port C, Bit 6
RESET, Reset pin: When the RSTDISBL Fuse is programmed, this pin functions as a normal I/O pin, and
the part will have to rely on Power-on Reset and Brown-out Reset as its reset sources. When the
RSTDISBL Fuse is unprogrammed, the reset circuitry is connected to the pin, and the pin can not be
used as an I/O pin.
If PC6 is used as a reset pin, DDC6, PORTC6 and PINC6 will all read 0.
AVR 8-Bit Microcontroller
I/O Ports
© 2017 Microchip Technology Inc.
Datasheet Complete
40001974A-page 89