Rainbow Electronics ATmega128RFA1 - Manual (Page 200)

200
8266A-MCU Wireless-12/09
ATmega128RFA1
Table 14-12. 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/DIG4 (ADC input channel 3 or Radio Transceiver RX/TX Indicator
Output)
PF2 ADC2/DIG2 (ADC input channel 2 or Radio Transceiver Antenna Diversity
Control Output)
PF1 ADC1 (ADC input channel 1)
PF0 ADC0 (ADC input channel 0)
• 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.
• 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.
• DIG4, ADC3 – Port F, Bit 3
ADC3, Analog to Digital Converter, Channel 3.
DIG4, Radio Transceiver RX/TX Indicator Output: If the bit PA_EXT_EN in
TRX_CTRL_1 is set to one then the PF3 pin serves as the Radio Transceiver
receive/transmit indicator output to control an external RF front-end.
• DIG2, ADC2 – Port F, Bit 2
ADC2, Analog to Digital Converter, Channel 2.
DIG2, Radio Transceiver Antenna Diversity Control Output: If the bit
ANT_EXT_SW_EN in ANT_DIV is set to one then the PF2 pin serves as a Radio
Transceiver output to control External Antenna Diversity.
• ADC1 – ADC0 – Port F, Bit 1:0
Analog to Digital Converter, Channel 1:0.