The SSIs are synchronous serial interfaces that are compatible with SPI, MICROWIRE, and TI's synchronous serial interfaces. The SSIs support both SPI controller and peripheral up to 4 MHz. The SSI modules support configurable phase and polarity.

The UARTs implement universal asynchronous receiver and transmitter functions. They 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 controller and peripheral.

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 SimpleLink™ CC13xx and CC26xx Software Development Kit (SDK).