ZHCS986B May 2012 – December 2018 TLV320DAC3203
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 Reset and the SPI_Select pin, which are HW control pins. Depending on the state of SPI_Select, the two control-bus pins SCL/SS and SDA/MOSI are configured for either I2C or SPI protocol.
Other digital IO pins can be configured for various functions via register control. An overview of available functionality is given in Multifunction Pins.