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ATmega164A/PA/324A/PA/644A/PA/1284/P
2018 Microchip Technology Inc. Data Sheet Complete DS40002070A-page 92
• 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.
• TMS/PCINT19 – Port C, Bit 3
TMS, JTAG Test Mode Select.
PCINT19, Pin Change Interrupt source 19: The PC3 pin can serve as an external interrupt source.
• TCK/PCINT18 – Port C, Bit 2
TCK, JTAG Test Clock.
PCINT18, Pin Change Interrupt source 18: The PC2 pin can serve as an external interrupt source.
• SDA/PCINT17 – Port C, Bit 1
SDA, two-wire Serial Bus Data Input/Output Line.
PCINT17, Pin Change Interrupt source 17: The PC1 pin can serve as an external interrupt source.
• SCL/PCINT16 – Port C, Bit 0
SCL, two-wire Serial Bus Clock Line.
PCINT16, Pin Change Interrupt source 16: The PC0 pin can serve as an external interrupt source.
Table 14-10 and Table 14-11 relate the alternate functions of Port C to the overriding signals shown in Figure
14-5 on page 85.