ATtiny48 datasheet(67/266 Pages) ATMEL

67 / 266 page

8008C–AVR–03/09

ATtiny48/88

10.3.3

Alternate Functions of Port C

The Port C pins with alternate functions are shown in Table 10-8.

The alternate pin configuration is as follows:

• PCINT15 – Port C, Bit 7

PCINT15: Pin Change Interrupt source 15. The PC7 pin can serve as an external interrupt

source.

• 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 interrupt

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 digital

power.

Table 10-8.

Port C Pins Alternate Functions

Port Pin

Alternate Function

PC7

PCINT15 (Pin Change Interrupt 15)

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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