Datasheet

85
8011O–AVR–07/10
ATmega164P/324P/644P
11.3.3 Alternate Functions of Port C
The Port C pins with alternate functions are shown in Table 11-9.
• TOSC2/PCINT23 – Port C, Bit 7
TOSC2, Timer Oscillator pin 2. The PC7 pin can serve as an external interrupt source to the
MCU.
PCINT23, Pin Change Interrupt source 23: The PC7 pin can serve as an external interrupt
source.
• TOSC1/PCINT22 – Port C, Bit 6
TOSC1, Timer Oscillator pin 1. The PC6 pin can serve as an external interrupt source to the
MCU.
PCINT22, Pin Change Interrupt source 22: The PC6 pin can serve as an external interrupt
source.
• TDI/PCINT21 – Port C, Bit 5
TDI, JTAG Test Data Input.
PCINT21, Pin Change Interrupt source 21: The PC5 pin can serve as an external interrupt
source.
• TDO/PCINT20 – Port C, Bit 4
TDO, JTAG Test Data Output.
PCINT20, Pin Change Interrupt source 20: The PC4 pin can serve as an external interrupt
source.
Table 11-9. Port C Pins Alternate Functions
Port Pin Alternate Function
PC7
TOSC2 (Timer Oscillator pin 2)
PCINT23 (Pin Change Interrupt 23)
PC6
TOSC1 (Timer Oscillator pin 1)
PCINT22 (Pin Change Interrupt 22)
PC5
TDI (JTAG Test Data Input)
PCINT21 (Pin Change Interrupt 21)
PC4
TDO (JTAG Test Data Output)
PCINT20 (Pin Change Interrupt 20)
PC3
TMS (JTAG Test Mode Select)
PCINT19 (Pin Change Interrupt 19)
PC2
TCK (JTAG Test Clock)
PCINT18 (Pin Change Interrupt 18)
PC1
SDA (2-wire Serial Bus Data Input/Output Line)
PCINT17 (Pin Change Interrupt 17)
PC0
SCL (2-wire Serial Bus Clock Line)
PCINT16 (Pin Change Interrupt 16)