SLAS778C February 2013 – September 2021 TAS2505
Only a small number of digital pins are dedicated to a single function; whenever possible, the digital pins have a default function, and also can be reprogrammed to cover alternative functions for various applications.
The fixed-function pins are RST LDO_SEL and the SPI_SEL pin, which are HW control pins. Depending on the state of SPI_SEL, the two control-bus pins SCL/SSZ and SDA/MOSI are configured for either I2C or SPI protocol.
Other digital IO pins can be configured for various functions through register control. An overview of available functionality is given in Section 7.4.3.