The SSI is a synchronous serial interface that is compatible with SPI, MICROWIRE, and TI's synchronous serial interfaces. The SSI support both SPI master and slave up to 4 MHz. The SSI module support configurable phase and polarity.

The UART implement universal asynchronous receiver and transmitter functions. It support flexible baud-rate generation up to a maximum of 3 Mbps.

The I²S interface is used to handle digital audio and can also be used to interface pulse-density modulation microphones (PDM).

The I²C interface is also used to communicate with devices compatible with the I²C standard. The I²C interface can handle 100 kHz and 400 kHz operation, and can serve as both master and slave.

The I/O controller (IOC) controls the digital I/O pins and contains multiplexer circuitry to allow a set of peripherals to be assigned to I/O pins in a flexible manner. All digital I/Os are interrupt and wake-up capable, have a programmable pullup and pulldown function, and can generate an interrupt on a negative or positive edge (configurable). When configured as an output, pins can function as either push-pull or open-drain. Five GPIOs have high-drive capabilities, which are marked in bold in Section 7. All digital peripherals can be connected to any digital pin on the device.

For more information, see the CC13x1x3, CC26x1x3 SimpleLink™ Wireless MCU Technical Reference Manual.