I use the PIC24EP512GU810 processor to access a MRF24WB0MB on SPI3 with the TCP/IP STack v5.42.
SDO3 of PIC connected to RP109 (RF 13) - Pullup on 3,3V
SDI3 of PIC connected to RPI 45 (RB 13) - no Pullup, no Pulldown
SCK3 of PIC connected to RP
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