Architecture

• 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.

• 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.

• 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 mode. 

• 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 1M*16-bit.

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

• 5 endpoints, three of which are 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 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.
• 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.

• 2 channels, used for MIC,input, supporting audio superposition and simple reverberation processing;
• Supporting saving the coded recorded data to SD or U disc.

• Integrated 6-channel 10-bit ADC, can be used as keys, supporting MCU wake-up function.
• 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.