This post explains for the chip GPD2856A.
The Part Number is GPD2856A.
The function of this semiconductor is MP3 player with FM radio function
Package : SOP16 package
Manufacturers : Generalplus
Preview images :
1. Support MP3 playback format.
2. It can play T card/SD card, U disk, FM, and external audio source (LineIn), then insert first and play first, and can also be switched by Mode key.
3. Automatically detect whether the earphone is plugged in, and then directly switch the external power amplifier through the IO port (Mute) without the need for an external transistor.
4. Supports storing volume, number of songs,… in T card/SD card, U disk, users can save EEPROM
5. It can automatically detect whether there is an external EEPROM and decide whether to store the settings in EEPROM or T card/SD card, U disk.
6. One AD-key port is used to realize various key combinations.
7. There are two groups of AD-key keyboards to choose from.
8. Support 3 FM radio chips: RDA5807, BK1080 and RTC6207E.
9. Infrared remote control is not supported.
10. USB device mode is not supported.
11. Support USB audio mode.