Rainbow-electronics ATmega128L Manual de usuario descargar pdf (Pagina 78)

ATmega128(L)

2467B–09/01

Alternate Functions of Port F The Port F has an alternate function as analog input for the ADC as shown in Table 42.

If some Port F pins are configured as outputs, it is essential that these do not switch

when a conversion is in progress. This might corrupt the result of the conversion. In

ATmega103 compatibility mode Port F is input only. 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 Register (scan chains). When the JTAG interface is enabled, this pin can not be

used as an I/O pin.

• TCK, 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.

Table 41. Overriding Signals for Alternate Functions in PE3..PE0

Signal Name PE3/AIN1/OC3A PE2/AIN0/XCK0 PE1/PDO/TXD0 PE0/PDI/RXD0

PUOE 0 0 TXEN0 RXEN0

PUOV 0 0 0 PORTE0 • PUD

DDOE 0 0 TXEN0 RXEN0

DDOV 0 0 1 0

PVOE OC3B ENABLE UMSEL0 TXEN0 0

PVOV OC3B XCK0 OUTPUT TXD0 0

DIEOE 0 0 0 0

DIEOV 0 0 0 0

DI 0 XCK0 INPUT – RXD0

AIO AIN1 INPUT AIN0 INPUT ––

Table 42. 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)

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 330 331

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Rainbow-electronics ATmega128L Manual de usuario Pagina 78