Rainbow Electronics ATmega162V - Manual (Page 74)

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ATmega162/V
2513E–AVR–09/03
Alternate Functions of Port C The Port C pins with alternate functions are shown in Table 35. If the JTAG interface is
enabled, the pull-up resistors on pins PC7(TDI), PC5(TMS) and PC4(TCK) will be acti-
vated even if a reset occurs.
• A15/TDI/PCINT15 – Port C, Bit 7
A15, External memory interface address bit 15.
TDI, JTAG Test Data In: Serial input data to be shifted into the Instruction Register or
Data Register (scan chains). When the JTAG interface is enabled, this pin can not be
used as an I/O pin.
PCINT15: The pin can also serve as a pin change interrupt.
• A14/TDO/PCINT14 – Port C, Bit 6
A14, External memory interface address bit 14.
TDO, JTAG Test Data Out: Serial output data from Instruction Register or Data Regis-
ter. When the JTAG interface is enabled, this pin can not be used as an I/O pin. In TAP
states that shift out data, the TD0 pin drives actively. In other states the pin is pulled
high.
PCINT14: The pin can also serve as a pin change interrupt.
Table 35. Port C Pins Alternate Functions
Port Pin Alternate Function
PC7
A15 (External memory interface address bit 15)
TDI (JTAG Test Data Input)
PCINT15 (Pin Change INTerrupt 15)
PC6
A14 (External memory interface address bit 14)
TDO (JTAG Test Data Output)
PCINT14 (Pin Change INTerrupt 14)
PC5
A13 (External memory interface address bit 13)
TMS (JTAG Test Mode Select)
PCINT13 (Pin Change INTerrupt 13)
PC4
A12 (External memory interface address bit 12)
TCK (JTAG Test Clock)
PCINT12 (Pin Change INTerrupt 12)
PC3
A11 (External memory interface address bit 11)
PCINT11 (Pin Change INTerrupt 11)
PC2
A10 (External memory interface address bit 10)
PCINT10 (Pin Change INTerrupt 10)
PC1
A9 (External memory interface address bit 9)
PCINT9 (Pin Change INTerrupt 9)
PC0
A8 (External memory interface address bit 8)
PCINT8 (Pin Change INTerrupt 8)