Rainbow Electronics Atmega169L - Manual (Page 67)

67
ATmega169V/L
2514A–AVR–08/02
Note: 1. AIN0D and AIN1D is described in “Digital Input Disable Register 0 – DIDR0” on page
190.
Alternate Functions of Port F The Port F has an alternate function as analog input for the ADC as shown in Table 41.
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. 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.
Table 40. Overriding Signals for Alternate Functions in PE3..PE0
Signal
Name PE3/AIN1/
PCINT3 PE2/XCK/AIN0/
PCINT2 PE1/TXD/
PCINT1
PE0/RXD/PCINT0
PUOE 0 XCK OUTPUT
ENABLE TXEN RXEN
PUOV 0 XCK 0 PORTE0 • PUD
DDOE 0 0 TXEN RXEN
DDOV 0 0 1 0
PVOE 0 0 TXEN 0
PVOV 0 0 TXD 0
PTOE – – – –
DIEOE (PCINT3 •
PCIE0) +
AIN1D
(1)
(PCINT2 • PCIE0) +
AIN0D
(1)
PCINT1 •
PCIE0 PCINT0 • PCIE0
DIEOV PCINT3 • PCIE0 PCINT2 • PCIE0 1 1
DI PCINT3 INPUT XCK/PCINT2 INPUT PCINT1 INPUT RXD/PCINT0
INPUT
AIO AIN1 INPUT AIN0 INPUT – –
Table 41. 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)