diff --git a/mcu/wch_ch32v203.yaml b/mcu/wch_ch32v203.yaml
new file mode 100644
index 0000000..5c77a89
--- /dev/null
+++ b/mcu/wch_ch32v203.yaml
@@ -0,0 +1,512 @@
+name: CH32V203
+variations: F6P, F8P, F8U, G6U, G8R, KxT, CxT, CxU, RBT # TSSOP20, TSSOP20, QFN20, QFN28, QSOP28, LQFP32, LQFP48, QFN48, LQFP64M
+# CH32V203AxB
+# A = pin count: J = 8, A = 16, F = 20, G = 28, K = 32, T = 36, C = 48, R = 64, W = 68, V = 100, Z = 144
+# B = package: T = LQFP, U = QFN, R = QSOP, P = TSSOP, M = SOP
+description: RISC-V micro-controller
+keywords: MCU, Micro-Controller
+datasheet: http://www.wch-ic.com/downloads/CH32V203DS0_PDF.html
+
+pinout@F6P: # TSSOP20
+  PORTA:
+    PA0-WKUP: 6
+    PA1: 7
+    PA2: 8
+    PA3: 9
+    PA4: 10
+    PA5: 11
+    PA6: 12
+    PA7: 13
+    PA11: 17
+    PA12: 18
+    PA13: 19
+    PA14: 20
+  PORTB:
+    PB1: 14
+    PB8: 1
+  CTRL:
+    BOOT0: 1 
+    OSC_IN: 2
+    OSC_OUT: 3
+    NRST: 4
+  GROUND:
+    VSS: 15
+  POWER:
+    VDD: 16
+    VDDA: 5
+
+pinout@F8P: # TSSOP20
+  PORTA:
+    PA0-WKUP: 6
+    PA1: 7
+    PA2: 8
+    PA3: 9
+    PA4: 11
+    PA5: 12
+    PA6: 10
+    PA7: 13
+    PA8: 18
+    PA9: 19
+    PA10: 20
+    PA13: 1
+    PA14: 2
+  PORTB:
+    PB0: 14
+    PB13: 15
+    PB14: 16
+    PB15: 17
+  CTRL:
+    NRST: 5
+  GROUND:
+    VSS: 3
+  POWER:
+    VDD: 4
+
+pinout@F8U: # QFN20
+  PORTA:
+    PA0-WKUP: 1
+    PA1: 2
+    PA2: 3
+    PA3: 4
+    PA4: 5
+    PA5: 6
+    PA6: 20
+    PA7: 7
+    PA8: 14
+    PA9: 15
+    PA10: 18
+    PA11: 17
+    PA12: 16
+    PA13: 16
+    PA14: 17
+  PORTB:
+    PB0: 8
+    PB1: 9
+    PB10: 10
+    PB11: 11
+    PB14: 12
+    PB15: 13
+  GROUND:
+    VSS: 21 # pad 
+  POWER:
+    VDD: 19
+
+pinout@G6U: # QFN28
+  PORTA:
+    PA0-WKUP: 6
+    PA1: 7
+    PA2: 8
+    PA3: 9
+    PA4: 10
+    PA5: 11
+    PA6: 12
+    PA7: 13
+    PA9: 18
+    PA10: 19
+    PA11: 19
+    PA12: 20
+    PA13: 21
+    PA14: 22
+    PA15: 23
+  PORTB:
+    PB0: 14
+    PB1: 15
+    PB3: 24
+    PB4: 25
+    PB5: 26
+    PB6: 27
+    PB7: 28
+    PB8: 1
+  CTRL:
+    BOOT0: 1
+    OSC_IN: 2
+    OSC_OUT: 3
+    NRST: 4
+  GROUND:
+    VSS: 16, 21 # pad
+  POWER:
+    VDD: 17
+    VDDA: 5
+
+pinout@G8R: # QSOP28
+  PORTA:
+    PA0-WKUP: 9
+    PA1: 10
+    PA2: 11
+    PA3: 12
+    PA4: 15
+    PA5: 16
+    PA6: 13
+    PA7: 17
+    PA8: 24
+    PA9: 25
+    PA10: 26
+    PA11: 27
+    PA12: 28
+    PA13: 28
+    PA14: 1
+  PORTB:
+    PB0: 14
+    PB1: 20
+    PB5: 1
+    PB6: 2
+    PB7: 3
+    PB8: 5
+    PB10: 18
+    PB11: 19
+    PB12: 20
+    PB13: 21
+    PB14: 22
+    PB15: 23
+  CTRL:
+    BOOT0: 4
+    NRST: 8
+  GROUND:
+    VSS: 7
+  POWER:
+    VDD: 6
+
+pinout@KxT: # LQFP32
+  PORTA:
+    PA0-WKUP: 6
+    PA1: 7
+    PA2: 8
+    PA3: 9
+    PA4: 10
+    PA5: 11
+    PA6: 12
+    PA7: 13
+    PA8: 18
+    PA9: 19
+    PA10: 20
+    PA11: 21
+    PA12: 22
+    PA13: 23
+    PA14: 24
+    PA15: 25
+  PORTB:
+    PB0: 14
+    PB1: 15
+    PB3: 26
+    PB4: 27 
+    PB5: 28
+    PB6: 29
+    PB7: 30
+    PB8: 31
+  CTRL:
+    BOOT0: 31
+    OSC_IN: 2
+    OSC_OUT: 3
+    NRST: 4
+  GROUND:
+    VSS: 16, 32
+  POWER:
+    VDD: 1, 17
+
+pinout@CxT: # LQFP48
+  PORTA:
+    PA0-WKUP: 10
+    PA1: 11
+    PA2: 12
+    PA3: 13
+    PA4: 14
+    PA5: 15
+    PA6: 16
+    PA7: 17
+    PA8: 29
+    PA9: 30
+    PA10: 31
+    PA11: 32
+    PA12: 33
+    PA13: 34
+    PA14: 37
+    PA15: 38
+  PORTB:
+    PB0: 18
+    PB1: 19
+    PB2: 20
+    PB3: 39
+    PB4: 40 
+    PB5: 41
+    PB6: 42
+    PB7: 43
+    PB8: 45
+    PB9: 46
+    PB10: 21
+    PB11: 22
+    PB12: 25
+    PB13: 26
+    PB14: 27
+    PB15: 28
+  PORTC:
+    PC13-TAMPER-RTC: 2
+    PC14-OSC32_IN: 3
+    PC15-OSC32_OUT: 4
+  CTRL:
+    BOOT0: 44
+    OSC_IN: 5
+    OSC_OUT: 6
+    NRST: 7
+  GROUND:
+    VSS: 23, 35, 47
+    VSSA: 8
+  POWER:
+    VDD: 24, 36, 48
+    VDDA: 9
+    VBAT: 1
+
+pinout@CxU: # QFN48
+  PORTA:
+    PA0-WKUP: 10
+    PA1: 11
+    PA2: 12
+    PA3: 13
+    PA4: 14
+    PA5: 15
+    PA6: 16
+    PA7: 17
+    PA8: 29
+    PA9: 30
+    PA10: 31
+    PA11: 32
+    PA12: 33
+    PA13: 34
+    PA14: 37
+    PA15: 38
+  PORTB:
+    PB0: 18
+    PB1: 19
+    PB2: 20
+    PB3: 39
+    PB4: 40 
+    PB5: 41
+    PB6: 42
+    PB7: 43
+    PB8: 45
+    PB9: 46
+    PB10: 21
+    PB11: 22
+    PB12: 25
+    PB13: 26
+    PB14: 27
+    PB15: 28
+  PORTC:
+    PC13-TAMPER-RTC: 2
+    PC14-OSC32_IN: 3
+    PC15-OSC32_OUT: 4
+  CTRL:
+    BOOT0: 44
+    OSC_IN: 5
+    OSC_OUT: 6
+    NRST: 7
+  GROUND:
+    VSS: 23, 35, 47, 49
+    VSSA: 8
+  POWER:
+    VDD: 24, 36, 48
+    VDDA: 9
+    VBAT: 1
+
+pinout@RBT: # LQFP64
+  PORTA:
+    PA0-WKUP: 14
+    PA1: 15
+    PA2: 16
+    PA3: 17
+    PA4: 20
+    PA5: 21
+    PA6: 22
+    PA7: 23
+    PA8: 41
+    PA9: 42
+    PA10: 43
+    PA11: 44
+    PA12: 45
+    PA13: 46
+    PA14: 49
+    PA15: 50
+  PORTB:
+    PB0: 26
+    PB1: 27
+    PB2: 28
+    PB3: 55
+    PB4: 56
+    PB5: 57
+    PB6: 58
+    PB7: 59
+    PB8: 61
+    PB9: 62
+    PB10: 29
+    PB11: 30
+    PB12: 33
+    PB13: 34
+    PB14: 35
+    PB15: 36
+  PORTC:
+    PC0: 8
+    PC1: 9
+    PC2: 10
+    PC3: 11
+    PC4: 24
+    PC5: 25
+    PC6: 37
+    PC7: 38
+    PC8: 39
+    PC9: 40
+    PC10: 51
+    PC11: 52
+    PC12: 53
+    PC13-TAMPER-RTC: 2
+    PC14-OSC32_IN: 3
+    PC15-OSC32_OUT: 4
+  PORTD:
+    PD2: 54
+  CTRL:
+    OSC_IN: 5
+    OSC_OUT: 6
+    NRST: 7
+    BOOT0: 60
+  GROUND:
+    VSS: 31, 63, 18
+    VSSA: 12
+  POWER:
+    VDD: 32, 64, 19
+    VDDA: 13
+    VBAT: 1
+  NC: 47, 48
+
+properties:
+  in: NRST, BOOT0
+  bidir: PA0-WKUP, PA1-15, PB0-15, PC0-12, PC13-TAMPER-RTC, PC14-OSC32_IN, PC15-OSC32_OUT, PD0-15, PE0-15, PF0-15, PG0-15
+  passive: OSC_IN, OSC_OUT
+  power: VDD, VDDA, VBAT
+  nc: NC
+  ground: VSS, VSSA
+  inverted: NRST
+
+schematic:
+  symbol: IC
+  left: CTRL, PORTA
+  right: PORTB, PORTC, PORTD
+  top: POWER
+  bottom: GROUND
+
+housing@F6P: # TSSOP20
+  suffix: F6P
+  pattern: SOP
+  bodyWidth: 4.4
+  bodyLength: 6.5
+  height: 1.1
+  leadWidth: 0.25
+  leadLength: 0.6
+  leadSpan: 6.4
+  pitch: 0.65
+  leadCount: 20
+
+housing@F8P: # TSSOP20
+  suffix: F8P
+  pattern: SOP
+  bodyWidth: 4.4
+  bodyLength: 6.5
+  height: 1.1
+  leadWidth: 0.25
+  leadLength: 0.6
+  leadSpan: 6.4
+  pitch: 0.65 # e
+  leadCount: 20
+
+housing@G8R: # QSOP28
+  suffix: G8R
+  pattern: SOP
+  bodyWidth: 3.9
+  bodyLength: 9.9
+  height: 1.55
+  leadWidth: 0.25
+  leadLength: 0.65
+  leadSpan: 6.0
+  pitch: 0.635
+  leadCount: 28
+
+housing@F8U: # QFN20
+  suffix: F8U
+  pattern: QFN
+  bodyWidth: 3.0
+  bodyLength: 3.0
+  height: 0.75
+  leadWidth: 0.2
+  leadLength: 0.4
+  pitch: 0.4
+  leadCount: 20
+  tabWidth: 1.7
+  tabLength: 1.7
+  tabPosition: 0.0, 0.0
+
+housing@G6U: # QFN28
+  suffix: G6U
+  pattern: QFN
+  bodyWidth: 4.0
+  bodyLength: 4.0
+  height: 0.75
+  leadWidth: 0.2
+  leadLength: 0.4
+  pitch: 0.4
+  leadCount: 28
+  tabWidth: 2.8
+  tabLength: 2.8
+  tabPosition: 0.0, 0.0
+
+housing@CxU: # QFN48
+  suffix: CxU
+  pattern: QFN
+  bodyWidth: 7.0
+  bodyLength: 7.0
+  height: 0.85
+  leadWidth: 0.25
+  leadLength: 0.4
+  pitch: 0.5
+  leadCount: 48
+  tabWidth: 5.5
+  tabLength: 5.5
+  tabPosition: 0.0, 0.0
+
+housing@KxT: # LQFP32
+  suffix: KxT
+  pattern: QFP
+  bodyWidth: 7.0
+  bodyLength: 7.0
+  height: 1.5
+  leadWidth: 0.35
+  leadLength: 0.6
+  leadSpan: 9.0
+  pitch: 0.8
+  leadCount: 32
+  rowCount: 8
+  columnCount: 8
+ 
+housing@CxT: # LQFP48
+  suffix: CxT
+  pattern: QFP
+  bodyWidth: 7.0
+  bodyLength: 7.0
+  height: 1.5
+  leadWidth: 0.2
+  leadLength: 0.6
+  leadSpan: 9.0
+  pitch: 0.5
+  leadCount: 48
+  rowCount: 12
+  columnCount: 12
+ 
+housing@RBT: # LQFP64M
+  suffix: RBT
+  pattern: QFP
+  bodyWidth: 10.0
+  bodyLength: 10.0
+  height: 1.5
+  leadWidth: 0.22
+  leadLength: 0.6
+  leadSpan: 12.0
+  pitch: 0.5
+  leadCount: 64
+  rowCount: 16
+  columnCount: 16