diff --git a/data/registers/rcc_f4.yaml b/data/registers/rcc_f4.yaml
index 61a7a55..4929120 100644
--- a/data/registers/rcc_f4.yaml
+++ b/data/registers/rcc_f4.yaml
@@ -1163,10 +1163,6 @@ fieldset/AHB1ENR:
     bit_size: 1
     description: USB OTG HSULPI clock enable
     name: OTGHSULPIEN
-  - bit_offset: 31
-    bit_size: 1
-    description: RNG clock enable
-    name: RNGEN
   - bit_offset: 9
     bit_size: 1
     description: IO port J clock enable
@@ -1353,10 +1349,6 @@ fieldset/AHB1RSTR:
     bit_size: 1
     description: USB OTG HS module reset
     name: OTGHSRST
-  - bit_offset: 31
-    bit_size: 1
-    description: RNGRST
-    name: RNGRST
   - bit_offset: 9
     bit_size: 1
     description: IO port J reset
diff --git a/data/registers/rcc_l4.yaml b/data/registers/rcc_l4.yaml
index 382b04b..9e498ea 100644
--- a/data/registers/rcc_l4.yaml
+++ b/data/registers/rcc_l4.yaml
@@ -616,10 +616,6 @@ fieldset/APB1ENR1:
     bit_size: 1
     description: USART3 clock enable
     name: USART3EN
-  - bit_offset: 18
-    bit_size: 1
-    description: USART1 clock enable
-    name: USART1EN
   - bit_offset: 19
     bit_size: 1
     description: UART4 clock enable