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The SC6137D is an audio processor integrated with USB\SD\CD interfaces, with built-in MCU is well suitable for secondary design. The built-in high performance RISC supports file system on CD\USB disc\SD card, and is capable of encoding and decoding mainstream audio formats. It integrates video processing unit VOU and a video DAC, supporting CVBS and Y/C signal outputs, and analog R\G\B signal output.

The SC6137D can be connected to an external RF transceiver, implementing music play and voice communication through Bluetooth.

Main feature


  • Dual-core structure formed by low power dissipation 8-bit MCU and high performance 32-bit RISC

  • Performance of MCU core is 4 times better than traditional 51, the instruction set is compatible with traditional MCS-51 instruction set.

  • CACHE+SPI structure , improves SPI flash access efficiency;

  • MCU can control read-write of SPI flash when the Cache is locked;

  • Internal RAM of MCU is 256 bytes, external RAM is 2K+512 bytes, the instruction space can be expanded to 8M byte through SPI flash,

  • The built-in confidential storage unit supports program encryption in SPI flash;

  • High-performance 32-bit RISC core, 6-level pipelines.

  • Harvard Cache architecture with separate 8KB Instruction and Data Cache, single-cycle multiplication/accumulation operations, on-chip debugging (OCD) supported ;

  • 32-bit instruction and data space, with MMU function, operating system supported; 


  • Integrated RF Amp, servo control and CDDA/CDROM decoder.

  • Disc format:

  • CD/CD-R/CD-RW physical formats;

  • CD-DA, CDROM, and CDROMXA data formats;

  • CD-TEXT function;

  • Applications:

  • Accessing from CLV 4X speed optical pickup unit;

  • Electronic shock proof function;

  • CD transcription for record while playing; 

Clock & Power Manager

  • External 32.768KHz and 12MHz oscillators;

  • Built-in MCU PLL with 32.768KHz reference clock and System PLL12MHz reference clock, Audio PLL and USB PLL;

  • Clock frequency division control, MCU is able to work at 9-level frequencies in range of 32.768KHz ~ 24MHz, while RISC at 15-level frequencies in range of 30MHz ~ 162MHz.

  • Single 3.3V power supply, built-in DC-DC and LDO modules, provided to RISC and MCU cores.

  • RTC separately powered, with calendar function, 256-byte RAM which can save information when the main circuit is power failure.

  • Multi low-power operating modes supported, such as stop, powerdown mode. 

Memory Controller

  • Integrated 32KB OTP, used for program running, Rom data protection.

  • SPI flash controller.

  • SPI flash 1/2-wire modes;

  • Firmware in SPI flash able to be upgraded, can starting program from SPI flash;

  • MCU program is able to be run in SPI flash, debugging code downloadable; 

  • SDRAM controller.

  • High-efficiency SDRAM Interface supports operation with 16-bit data.

  • Supporting SDRAM low-power modes, such as self-refresh, power down, etc.

  • Packaged with SDRAM die of 2M*16-bit; 


  • On-chip USB full/low speed controller, support host/device mode.

  • 5 endpoints, three of which are of INOUT type;

  • Integrated DMA , supports real-time transfer, interrupt transfer, bulk transfer, and control transfer

  • Support USB wakeup and suspend;

  • Support USB audio application;

  • Integrated two SD/MMC/SDIO controllers, supporting SD/MMC/SDIO protocol, general SPI supported.

  • Integrated high-speed UART controller.

  • Up to 4Mbps baud rate, with 64-byte buffer, DMA controlled data stream transmission.

  • Integrated two I2S control modules.

  • Supporting sampling rate up to 24 -bit@192KHz;

  • DMA-controlled data stream transmission;

  • Supporting audio 5.1 channel out and 2.0 channel in/out. 

  • Integrated SPDIF output, sampling rate up to 24-bit@96KHz, DMA controlled data stream transmission.

  • Integrated one-channel 18-bit DAC, analog output LINEOUT_R and LINEOUT_L.

  • Integrated I2C host/slave control interfaces;

  • Integrated 4-channel PWM outputs;

  • Integrated 16-bit audio ADC.

  • 3 channels, can be used for MIC input, supporting audio superposition and simple reverberation processing;

  • Supporting saving the coded recorded data to SD or U disc;

  • Integrated 8-channel 10-bit ADC, can be used as keys, supporting MCU wake-up function.

  • Integrated 4*32 segment LCD drive controller.

  • Integrated 4-channel video DAC, supporting CVBS and Y/C output simultaneously, or analog R\G\B output independently.

  • Integrated digital video interface.

  • Support BT656,BT601 standard format output;

  • Support 24-bit RGB888 standard format output;

  • Supporting driving for the 6.4, 7, 8 inch LCD digital screen;

  • Integrated programmable GPIO, four-grade drive current configurable (2mA/4mA/8mA/24mA), pull-up or open-drain configurable.


  • Support ADPCM, MP3*, WMA*, LC-AAC*, OGG, FLAC*, APE* decode.

  • Support ADPCM and MP3* encode.

  • Able to embed EQ software.

  • Supports various audio processing with software embedded, such as speed & pitch change or speed change without changing pitch for audio files in DISC, USB, SD card.

  • Support embedded the Bluetooth protocol stack, supports profile such as A2DP, HFP, AVRCP, and PBAP.

  • Support built-in noise suppression and echo cancellation algorithm to realize the Bluetooth voice communication function

Block Diagram