23.4.2.7 Mono Mode vs. Stereo Mode

The SPI module enables the audio data transmission in Mono or Stereo mode by setting the AUDMONO bit (SPIxCON1[27]). When the AUDMONO bit is set to ‘0’ (Stereo mode), the SPIx Shift register uses each FIFO location once, which gives each channel a unique stream of data for stereo data. When the AUDMONO bit is set to ‘1’ (Mono mode), the SPIx Shift register uses each FIFO location twice to give each channel the same mono stream of audio data.