8-bit enhanced USB master-slave microcontroller CH558


CH558 is a MCS51 compatible E8051 core microcontroller, 79% instructions of CH558 is single byte or single cycle, and average instruction speed is 8 to 15 times faster than the standard MCS51. CH558 support up to 56MHz system clock, built-in 40KB Flash-ROM, 256B on-chip iRAM, 4KB on-chip xRAM, and some of xRAM support DMA mode. CH558 built-in ADC converter, 4timers/PWM, 2UART, 2*SPI, and a full-speed USB-Device port.


  • Enhanced E8051 core CPU, 8-15 times faster than the standard MCS51, unique fast copy commandof the XRAM data;
  • Built-in 32KB Code Flash,5KB Data Flash, and3KB for BootLoader, support USB and UART ISP;
  • Built-in 4KB XRAM and internal 256B iRAM;
  • Built-in DMA controller with support for USB and Timer3, ADC and LED control;
  • Built-in USB controller and USB transceiver, support USB2.0 full speed and low speed host or device mode;
  • 4x timer / counter, support 3-channel signal capture and 3 PWM output;
  • Provides 2 full-duplex asynchronous serial ports, serial port 1 has built-in 8-byte FIFO, and supports 485-mode data transmission and reception;
  • Provides one SPI communication interface, built-in FIFO, support master / slave mode;
  • An 8-channel 10/11-bit ADC analog-to-digital converter multiplexed with GPIO is provided;
  • The built-in clock and PLL also support external crystals;
  • Package: SSOP20, LQFP48.

Develop resources

ISP Download: USB or serial port

  1. CH558DS1.PDF(CH558datasheetl)
  2. ISP software,WCHISPTool_Setup.exe
  3. CH559EVT.ZIP, including:
    • CH559 example program (C language)
    • CH559 development board schematic and PCB diagram