Programming the FPC402 is accomplished through a single SPI or I2C interface, depending on the PROTOCOL_SEL pin state. To simplify configuration, a C function library is provided which can be integrated into the system software or used as a reference. The existence of basic SPI or I2C read and write functions is assumed within the provided C function library. The exact implementation of SPI or I2C read and write functions is beyond the scope of the C function library. Click here to request access to the FPC401 Programmer's Guide (SNLU221) more details about the register map.