---
name: CH32X03x Series
# NOTE: mcu_type is hex-encoded, not "10" in base-10
mcu_type: 0x13
device_type: 0x23
support_net: false
support_usb: true
support_serial: true
description: CH32X03x RISC-V4C Series
# RM Section 20.5
config_registers:
  - offset: 0x00
    name: RDPR_USER
    description: RDPR, nRDPR, USER, nUSER
    reset: 0xFFFF5AA5
    fields:
      - bit_range: [7, 0]
        name: RDPR
        description: Read Protection. 0xA5 for unprotected, otherwise read-protected(ignoring WRP)
        explaination:
          0xa5: Unprotected
          _: Protected
      # byte 2, [0:0] + 16
      - bit_range: [16, 16]
        name: IWDG_SW
        description: Independent watchdog (IWDG) hardware enable
        explaination:
          1: IWDG enabled by the software, and disabled by hardware
          0: IWDG enabled by the software (decided along with the LSI clock)
      # [1:1] + 16
      - bit_range: [17, 17]
        name: STOP_RST
        description: System reset control under the stop mode
        explaination:
          1: Disable
          0: Enable
      # [2:2] + 16
      - bit_range: [18, 18]
        name: STANDBY_RST
        description: System reset control under the standby mode, STANDY_RST
        explaination:
          1: Disable, entering standby-mode without RST
          0: Enable
      # [4:3] + 16
      - bit_range: [20, 19]
        name: RST_MOD
        description: Reset mode
        explaination:
          0b00: Enable RST alternative function
          0b11: Disable RST alternative function, use PA21/PC3/PB7 as GPIO
          _: Error
  - offset: 0x04
    name: DATA
    description: Customizable 2 byte data, DATA0, nDATA0, DATA1, nDATA1
    reset: 0xFF00FF00
    type: u32
    fields:
      - bit_range: [7, 0]
        name: DATA0
      - bit_range: [23, 16]
        name: DATA1
  - offset: 0x08
    name: WRP
    # Each bit represents 4K bytes (16 pages) to store the write protection status
    description: Flash memory write protection status
    type: u32
    reset: 0xFFFFFFFF
    explaination:
      0xFFFFFFFF: Unprotected
      _: Some 4K sections are protected
variants:
  - name: CH32X035R8T6
    chip_id: 80
    flash_size: 64K
  - name: CH32X035C8T6
    chip_id: 81
    flash_size: 64K
  - name: CH32X035F8U6
    chip_id: 94
    flash_size: 64K
  - name: CH32X035G8U6
    chip_id: 86
    flash_size: 64K
  - name: CH32X035G8R6
    chip_id: 91
    flash_size: 64K

  - name: CH32X035F7P6
    chip_id: 87
    flash_size: 49152