C 8 0 5 1 F 9 6 x / S i 1 0 2 x
18
Rev. 0.2
5.11.1. P0.0 through P0.3
Pins P0.0 through P0.3 connect to the UDP SPI_LCD signals (SPI_LCD_SCK, SPI_LCD_MISO, SPI_LCD_MOSI,
SPI_LCD_NSS) by default. These signals support the optional Graphical LCD display I/O card when used with the
UDB motherboard. To disconnect these default connections, cut the traces on R1 through R4. Optionally, these
signals can also connect to the EBID SPI on the 40-pin radio card. R8 provides an option to use P0.0 as a voltage
reference.
5.11.2. P0.6
Pin P0.6 connects to EZRP_I2C_SDA by default. This signal supports I2C radios and EZRadio transceivers using
the 40-pin radio connector on the UDP motherboard.
5.11.3. P0.7
Pin P0.7 connects to EZRP_I2C_SCL by default. This signal supports I2C radios using the 40-pin radio connector
on the UDP motherboard. The MCU card provides optional connections to connect P0.7 to EZRP_RX_CLKOUT or
use P0.7 as the IREF current reference pin.
5.11.4. P1.4
Pin P1.4 normally connects to the potentiometer. Optionally, P1.4 can connect to EZR_ARSSI. This signal supports
an analog RSSI measurement using an EZRadio 40-pin test card.
5.11.5. P1.5
Pin P1.5 connects to GPIO_1 via R15 and R29 by default. To disconnect this signal, cut the trace on R15. This
signal supports the clear-to-send (CTS) signal for EZRadioPRO.
5.11.6. P1.6
Pin P1.6 normally connects to nIRQ using R17. Cut the trace on R17 to disconnect these signals. Note that P1.7
also connects to nIRQ on the UPPI Pico Board, so a trace on the UPPI Pico Board must also be cut.
5.11.7. P1.7
Pin P1.7 connects to SDN via R18. To disconnect these signals, cut the trace on R18. P1.7 also connects to SDN
on the UPPI Pico Board, so it is necessary to also cut a trace on the UPPI Pico Board.
5.11.8. P2.4
P2.4 normally connects to the PIEZO signal. This signal drives a piezo transducer on the graphical LCD I/O card.
5.11.9. P2.5
Pin P2.5 connects to the GPIO_0 via R20 and R28 by default. Cut the trace on R20 to disconnect these signals.
This signal supports direct mode communication with the Si1020 EZRadio.
5.11.10. P3.6
P3.6 normally connects to SPI_LCD_A0. This signal supports the Graphical LCD display I/O card.
P3.2
SW3/LED3
P3.3
SW4/LED4
P3.4
RF_EBIF_NSS
P4.6
ANT_A
EZR_CLKIN/
EZRP2_GPIO3
P4.7
GPIO2
EZRP_RX_CLKOUT/
EZRP_GPIO2
Table 1. MCU Pin Functions (Continued)
MCU Pin
MCU Card Function
UDP Motherboard Signal
Default
Optional
Default
Optional
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