8-bit Enhanced USB MCU - CH547


CH547 is an enhanced E8051 core MCU, compatible with MCS51 instruction set. 79% of its instructions are single-byte single-cycle instructions. CH547 features high run speed. CH547 has built-in 60KB Flash-ROM and 1K+256B RAM. CH547 has built-in USB controller and USB transceiver, supports USB Device mode, and supports USB2.0 full-speed (12Mbps) and low-speed (1.5Mbps) transfer. CH547 supports up to 64 bytes of data packet, with built-in FIFO, and supports DMA. CH547 provides abundant interface sources, including 4 UARTs and 4-channel PWM. CH547 also has 1-channel master/slave SPI, 12-channel 12-bit ADC, and supports voltage comparator. CH547 has 3 built-in timers and 1-channel signal capture. CH547 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 1KB XRAM and internal 256B RAM.
  • Built-in USB controller and USB transceiver, support USB2.0 full-speed and low-speed device. DMA capability.
  • 3 timers/counters. 1-channel signal capture and 4-channel PWM output.
  • 4 full-duplex UARTs.
  • One SPI communication interface supports master/slave mode.
  • 12-channel 12-bit ADC multiplexed with GPIO.
  • Provide 12-channel capacitor touch-key.
  • Built-in clock and PLL. An external crystal oscillator is also supported.
  • Packages: SOP16, QFN28, LQFP48.

Technical Resources

Downloading: USB interface /UART

  1. CH547DS1.PDF
  2. Tool: WCHISPTool_Setup.exe
  3. CH549EVT.ZIP,contains: (In terms of software and hardware, CH549 is compatible with CH547) CH547 reference routines (C programming language) CH547EVT evaluation board schematic and introduction

relation files

file name file content
CH549DS1.PDF CH549/CH548 datasheet. An 8-bit enhanced USB MCU with multiple interfaces. It provides 64K program ROM and 2K+256 RAM. It supports USB host, USB device and Type-C CC and PD. It provides 16-channel Touch-key, 16-channel ADC, 3 sets of timers, 8-channel PWM, 4-channel UART and 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