8-bit Enhanced Multi-Interface MCU - CH549


CH549 is an enhanced E8051 core MCU, compatible with MCS51 instruction set. 79% of its instructions are single-byte single-cycle instructions. CH549 features high run speed. CH549 has built-in 60KB Flash-ROM and 2K+256B RAM. CH549 has built-in USB controller and USB transceiver. CH549 supports USB Host mode and USB Device mode, supports USB2.0 full-speed (12Mbps) and low-speed (1.5Mbps) transfer, and supports USB PD and Type-C. CH549 supports up to 64 bytes of data packet, with built-in FIFO, and supports DMA. CH549 provides abundant interface sources, including 4 UARTs and 8-channel PWM. CH549 also has 1-channel master/slave SPI, 16-channel 12-bit ADC, and supports voltage comparator. CH549 has 3 built-in timers and 3-channel signal capture. CH549 supports up to 44 GPIOs.

System Block Diagram


  • Enhanced E8051 core CPU, the speed is 8-15 times faster than that of standard MCS51, with special XRAM data fast copy instruction.
  • Built-in 60KB Code Flash, 1KB Data Flash and 3KB BootLoader. ISP through USB or UART.
  • Built-in 2KB XRAM and internal 256B RAM.
  • Built-in USB controller and USB transceiver, support USB2.0 full-speed and low-speed host/device. DMA capability.
  • Built-in Type-C CC controller, supports USB PD.
  • USB flash drive file-level sub-routine library that supports FAT12/FAT16/FAT32 file system, to implement read/write USB flash drives.
  • 3 timers/counters. 3-channel signal capture and 8-channel PWM output.
  • 4 full-duplex UARTs.
  • One SPI communication interface supports master/slave mode.
  • 16-channel 12-bit ADC multiplexed with GPIO.
  • Built-in clock and PLL. An external crystal oscillator is also supported.
  • Packages: SOP16, QFN28, LQFP48.

Technical Resources

Downloading: USB interface /UART

  1. CH549DS1.PDF
  2. Tool: WCHISPTool_Setup.exe
  3. CH549EVT.ZIP,contains
    • CH549 reference routines (C programming language)
    • CH549EVT evaluation board schematic and introduction

relation files

file name file content
CH547DS1.PDF CH547/CH546 datasheet. 8-bit enhanced multi-interface USB MCU, with 64KB FlashROM, 1KB+256B RAM. The CH547/CH546 supports USB device, 12-channel ADC, 3 timers, 4 channels of PWM, 4 UARTs, SPI, etc.
WCHISPTool_Setup.exe MCU burning software of CH54x,CH55x,CH56x,CH643x,CH641x,CH57x,CH58x,CH59x,CH32F10x,CH32F20x,CH32V00x,CH32V10x,CH32V20x,CH32V30x,CH32X03x,CH32L10x