C8051F850-C-GM Datasheet, PDF (203/328 Pages) Silicon Laboratories – Low-Cost 8-bit MCU Family with up to 8 kB of Flash

Note: The SPI can be operated in either 3-wire or 4-wire modes, pending the state of the NSSMD1–
NSSMD0 bits in register SPI0CN. According to the SPI mode, the NSS signal may or may not be routed to
a port pin. The order in which SMBus pins are assigned is defined by the SWAP bit in the SMB0TC
register.
Rev. 1.0
182