Silicon Laboratories UDP C8051F370, User Manual

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C 8 0 5 1 F 3 9 x / F 3 7 x
12 Rev. 0.2
5.9. C8051F39x Board Default and Optional Connections
The C8051F39x MCU card has many default and optional connections for use with the UDP motherboard. The
default connections have shorting jumpers consisting of a 402 resistor footprint with solder connecting the two
pads. To disconnect a default connection, remove the solder between the pads. To reconnect, install a 0

402
resistor or connect the two pads with solder. The optional connections are non-populated (no-pop) resistor
footprints. To connect, install a 0

402 resistor or connect the two pads with solder.
Table 1 shows a summary of the default and optional connections for each pin. Further explanation of the UDP
motherboard signals can be found in Section 6.2.
Table 1. MCU Pin Functions
MCU Pin MCU Card Function
(via shorting blocks)
UDP Motherboard Signal
(via 402 resistor footprint)
Default Optional Default Optional
P0.0/VREF VREF
P0.1/IDAC0 IDAC0
P0.2/XTAL1 EXT_INT0
P0.3/XTAL2 EXT_INT1
P0.4/TX TX
P0.5/RX RX
P0.6 CTS
P0.7 Potentiometer RTS
P1.0
P1.1 CLKOUT0/SYSCLK
P1.2/IDAC1 IDAC1
P1.3 PCA_CEX0, SPI_SL-
CK_A
P1.4 SPI_MISO_A,
PCA_CEX1
P1.5 PCA_CEX2, SPI_-
MOSI_A
P1.6 SPI_NSS0_A, PCA
P1.7 SMBUS0_SDA, T0
P2.0 SMBUS0_SCL, T1,
ADC_IN0
P2.1 CP_OUT_A,
ADC_IN3
P2.2 CP_OUT_A_A,
ADC_IN2
P2.3 ADC_IN1 SMBUS_SDA_EZR
P2.4 SMBUS_SCL_EZR