STMicroelectronics 32L4R9IDISCOVERY - Table 32. SPDT Quad Switch

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UM2271 STMod+ GPIO sharing and multiplexing
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Table 32. SPDT quad switch
SPI UART / SPI UART
STMOD+_SEL_0 0 1 1 STMOD+_SEL_0 is GPIO6 of MFX_V3
STMOD+_SEL_1 0 0 1 STMOD+_SEL_1 is GPIO7 of MFX_V3
pin 1 CSN2 CSN2 CTS3 pin 1 is connected directly to PA6
pin 2 MOSI2 TXS3 TXS3
pin 3 MISO2 RXS3 RXS3
pin 4 SCK2 SCK2 RTSS3