·                  Mixes three audio sources

·                           General MIDI 1+ / SP-MIDI

·                           WAV (PCM + IMA ADPCM)

·                           Microphone or line input

·                  Encodes IMA ADPCM from microphone line input or mixed output

·                  Input streams can use different sample rates

·                  EarSpeaker Spatial Processing

·                  Bass and treble controls

·                  Operates with a single 12 - 13 MHz clock

·                  Internal PLL clock multiplier

·                  Low-power operation

·                  High-quality on-chip stereo DAC with no phase error between channels

·                  Stereo earphone driver capable of driving a 30­ ohm load

·                  Separate operating voltages for analog, digital and I/O

·                  5.5 KiB On-chip RAM for user code / data

·                  Serial control and data interfaces

·                  Can be used as a slave co-processor

·                  SPI flash boot for special applications

·                  UART for debugging purposes

·                  New functions may be added with software and 4 GPIO pins