diff --git a/data/registers/pwr_h7rm0399.yaml b/data/registers/pwr_h7rm0399.yaml
index 40bda89..9e7c628 100644
--- a/data/registers/pwr_h7rm0399.yaml
+++ b/data/registers/pwr_h7rm0399.yaml
@@ -166,6 +166,7 @@ fieldset/CR3:
     description: Step-down converter voltage output level selection
     bit_offset: 4
     bit_size: 2
+    enum: SDLEVEL
   - name: VBE
     description: VBAT charging enable
     bit_offset: 8
@@ -262,6 +263,17 @@ fieldset/WKUPFR:
     array:
       len: 6
       stride: 1
+enum/SDLEVEL:
+  bit_size: 2
+  variants:
+  - name: Reset
+    value: 0
+  - name: V1_8
+    value: 1
+  - name: V2_5
+    value: 2
+  - name: V2_5_ALT
+    value: 3
 enum/VOS:
   bit_size: 2
   variants:
diff --git a/data/registers/pwr_h7rm0455.yaml b/data/registers/pwr_h7rm0455.yaml
index 2d3943d..54a0f77 100644
--- a/data/registers/pwr_h7rm0455.yaml
+++ b/data/registers/pwr_h7rm0455.yaml
@@ -166,6 +166,7 @@ fieldset/CR3:
     description: Step-down converter voltage output level selection
     bit_offset: 4
     bit_size: 2
+    enum: SDLEVEL
   - name: VBE
     description: VBAT charging enable
     bit_offset: 8
@@ -262,6 +263,17 @@ fieldset/WKUPFR:
     array:
       len: 6
       stride: 1
+enum/SDLEVEL:
+  bit_size: 2
+  variants:
+  - name: Reset
+    value: 0
+  - name: V1_8
+    value: 1
+  - name: V2_5
+    value: 2
+  - name: V2_5_ALT
+    value: 3
 enum/VOS:
   bit_size: 2
   variants:
diff --git a/data/registers/pwr_h7rm0468.yaml b/data/registers/pwr_h7rm0468.yaml
index 7bb5267..d48059d 100644
--- a/data/registers/pwr_h7rm0468.yaml
+++ b/data/registers/pwr_h7rm0468.yaml
@@ -166,6 +166,7 @@ fieldset/CR3:
     description: Step-down converter voltage output level selection
     bit_offset: 4
     bit_size: 2
+    enum: SDLEVEL
   - name: VBE
     description: VBAT charging enable
     bit_offset: 8
@@ -262,6 +263,17 @@ fieldset/WKUPFR:
     array:
       len: 6
       stride: 1
+enum/SDLEVEL:
+  bit_size: 2
+  variants:
+  - name: Reset
+    value: 0
+  - name: V1_8
+    value: 1
+  - name: V2_5
+    value: 2
+  - name: V2_5_ALT
+    value: 3
 enum/VOS:
   bit_size: 2
   variants: