GENERAL DESCRIPTION
The MSM6688/6688L is a “solid-state recorder” IC developed using the ADPCM method. By externally connecting a microphone, a speaker, a speaker drive amplifier, and a dedicated register to store ADPCM data, it can record and play back voice data in a manner similar to a tape recorder.
The MSM6688 supports 5 V operation and has a stand-alone mode and a microcontroller interface mode.
The MSM6688L supports 3 V operation and controls recording/playback in microcontroller interface mode.
In the stand-alone mode, recording/playback conditions can be selected by pins and the MSM6688/6688L can be controlled by a simple drive timing. In the microcontroller interface mode, recording/playback can be controlled by commands from the microcontroller. In the microcontroller interface mode, the MSM6688/6688L is much more flexible than in the stand-alone mode.
In addition, the MSM6688/6688L can form easily a recording and playback circuit with fixed messages by connecting serial registers and serial voice ROMs as external memories.