I have a FRDM-KEAZ128 development board （part number FRDM-KEAZ128Q80）. There is a MC33903 SBC chip on the development board. I want to develop CAN now, but I don't want to configure the MC33903. I noticed that the MC33903 has a debug mode and can use the CAN transceiver without configuring the MC33903 via SPI. How to configure the circuit in the picture?