SPI Operation in Sleep Mode

The SPI Host mode will operate in Sleep, provided the clock source selected by SPIxCLK is active in Sleep mode. FIFOs will operate as they do when the part is awake. When TXR = 1, the transmit FIFO will need to contain data for transfers to take place in Sleep. All interrupts will still set the interrupt flags in Sleep, but only enabled interrupts will wake the device from Sleep.

The SPI Client mode will operate in Sleep because the clock is provided by an external host device. FIFOs will still operate and interrupts will set interrupt flags, and enabled interrupts will wake the device from Sleep.