Features

• 32-bit RISC-V4B processor
• Up to 144MHz system clock frequency
• Single-cycle multiplication and hardware division
• Up to 20KB SRAM, 64KB Flash
• Supply voltage: 2.5V/3.3V, GPIO unit is supplied independently
• Multiple low-power modes: sleep/stop/standby
• Down to 44.65uA/MHz in Run mode
• Down to 17.90uA/MHz in Sleep mode
• Power-on/power-down reset (POR/PDR), programmable voltage detector (PVD)
• 1 x 18-channel general DMA controllers
• 2 OPA amplifiers
• 10-channel 12-bit ADC, 10-channel TouchKey
• 4 timers
• One USB2.0 full-speed host/device interface and/or one USB2.0 full-speed device interface
• Up to 4 UARTs
• Up to ne CAN interface (2.0B active)
• Up to 2 I²C interfaces, up to 2 SPI interfaces
• Up to 37 I/O ports, can be mapped to 16 external interrupts
• Up to one CRC calculation unit, 96-bit unique ID
• Serial 2-wire debug interface

Software Development Tools

MounRiver Studio IDE

The Eclipse-based closed-source MounRiver Studio IDE is the official development environment provided by WCH. It supports Windows, Linux, and Mac. MounRiver Studio can be downloaded for free.

Open-Source GCC Toolchain

You can download a complete toolchain (GCC and OpenOCD) for Linux and Mac from the MounRiver Studio website. However, on Linux you can also install a GCC-based toolchain by running the following command:

sudo apt install build-essential libnewlib-dev gcc-riscv64-unknown-elf

Arduino IDE and PlatformIO Support

There are projects around to make the CH32V203 compatible with the Arduino IDE (arduino_core_ch32) and PlatformIO (platform-ch32v).