MODRR is the module path selection register, which is used as the mapping pins of CAN0/4 and SPI0/1/2.
For example, if CAN0 is selected as PM0/1 pin, configure MODRR_MODRR0&1=0. When MODRR_MODRR4=0, SPI0 selects PS4/5/6/7.
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