AT90USB646 datasheet(90/434 Pages) ATMEL

90 / 434 page

7593A–AVR–02/06

AT90USB64/128

10.3.7

Alternate Functions of Port F

The Port F has an alternate function as analog input for the ADC as shown in Table 10-18. If

some Port F pins are configured as outputs, it is essential that these do not switch when a con-

version is in progress. This might corrupt the result of the conversion. If the JTAG interface is

enabled, the pull-up resistors on pins PF7(TDI), PF5(TMS), and PF4(TCK) will be activated even

if a Reset occurs.

• TDI, ADC7 – Port F, Bit 7

ADC7, Analog to Digital Converter, Channel 7.

TDI, JTAG Test Data In: Serial input data to be shifted in to the Instruction Register or Data Reg-

ister (scan chains). When the JTAG interface is enabled, this pin can not be used as an I/O pin.

• TDO, ADC6 – Port F, Bit 6

ADC6, Analog to Digital Converter, Channel 6.

TDO, JTAG Test Data Out: Serial output data from Instruction Register or Data Register. When

the JTAG interface is enabled, this pin can not be used as an I/O pin.

The TDO pin is tri-stated unless TAP states that shift out data are entered.

• TMS, ADC5 – Port F, Bit 5

ADC5, Analog to Digital Converter, Channel 5.

TMS, JTAG Test Mode Select: This pin is used for navigating through the TAP-controller state

machine. When the JTAG interface is enabled, this pin can not be used as an I/O pin.

• TCK, ADC4 – Port F, Bit 4

ADC4, Analog to Digital Converter, Channel 4.

TCK, JTAG Test Clock: JTAG operation is synchronous to TCK. When the JTAG interface is

enabled, this pin can not be used as an I/O pin.

• ADC3 – ADC0 – Port F, Bit 3..0

Table 10-18. Port F Pins Alternate Functions

Port Pin

Alternate Function

PF7

ADC7/TDI (ADC input channel 7 or JTAG Test Data Input)

PF6

ADC6/TDO (ADC input channel 6 or JTAG Test Data Output)

PF5

ADC5/TMS (ADC input channel 5 or JTAG Test Mode Select)

PF4

ADC4/TCK (ADC input channel 4 or JTAG Test ClocK)

PF3

ADC3 (ADC input channel 3)

PF2

ADC2 (ADC input channel 2)

PF1

ADC1 (ADC input channel 1)

PF0

ADC0 (ADC input channel 0)

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