ATMEGA88 datasheet(73/349 Pages) ATMEL

73 / 349 page

ATmega48/88/168

2545D–AVR–07/04

Alternate Functions of Port C

The Port C pins with alternate functions are shown in Table 36.

The alternate pin configuration is as follows:

• RESET/PCINT14 – 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.

PCINT14: Pin Change Interrupt source 14. The PC6 pin can serve as an external inter-

rupt source.

• SCL/ADC5/PCINT13 – Port C, Bit 5

SCL, 2-wire Serial Interface Clock: When the TWEN bit in TWCR is set (one) to enable

the 2-wire Serial Interface, pin PC5 is disconnected from the port and becomes the

Serial Clock I/O pin for the 2-wire Serial Interface. In this mode, there is a spike filter on

the pin to suppress spikes shorter than 50 ns on the input signal, and the pin is driven by

an open drain driver with slew-rate limitation.

PC5 can also be used as ADC input Channel 5. Note that ADC input channel 5 uses dig-

ital power.

PCINT13: Pin Change Interrupt source 13. The PC5 pin can serve as an external inter-

rupt source.

• SDA/ADC4/PCINT12 – Port C, Bit 4

SDA, 2-wire Serial Interface Data: When the TWEN bit in TWCR is set (one) to enable

the 2-wire Serial Interface, pin PC4 is disconnected from the port and becomes the

Serial Data I/O pin for the 2-wire Serial Interface. In this mode, there is a spike filter on

the pin to suppress spikes shorter than 50 ns on the input signal, and the pin is driven by

an open drain driver with slew-rate limitation.

Table 36. Port C Pins Alternate Functions

Port Pin

Alternate Function

PC6

RESET (Reset pin)

PCINT14 (Pin Change Interrupt 14)

PC5

ADC5 (ADC Input Channel 5)

SCL (2-wire Serial Bus Clock Line)

PCINT13 (Pin Change Interrupt 13)

PC4

ADC4 (ADC Input Channel 4)

SDA (2-wire Serial Bus Data Input/Output Line)

PCINT12 (Pin Change Interrupt 12)

PC3

ADC3 (ADC Input Channel 3)

PCINT11 (Pin Change Interrupt 11)

PC2

ADC2 (ADC Input Channel 2)

PCINT10 (Pin Change Interrupt 10)

PC1

ADC1 (ADC Input Channel 1)

PCINT9 (Pin Change Interrupt 9)

PC0

ADC0 (ADC Input Channel 0)

PCINT8 (Pin Change Interrupt 8)

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