diff --git a/embassy-stm32/build.rs b/embassy-stm32/build.rs
index 4ecc97536..08c051956 100644
--- a/embassy-stm32/build.rs
+++ b/embassy-stm32/build.rs
@@ -379,6 +379,8 @@ fn main() {
 
     let mut clock_names = BTreeSet::new();
 
+    let mut rcc_cfgr_regs = BTreeSet::new();
+
     for p in METADATA.peripherals {
         if !singletons.contains(&p.name.to_string()) {
             continue;
@@ -457,6 +459,8 @@ fn main() {
                     let field_name = format_ident!("{}", field_name);
                     let enum_name = format_ident!("{}", enum_name);
 
+                    rcc_cfgr_regs.insert((fieldset_name.clone(), field_name.clone(), enum_name.clone()));
+
                     let match_arms: TokenStream = enumm
                         .variants
                         .iter()
@@ -539,6 +543,70 @@ fn main() {
         }
     }
 
+    if !rcc_cfgr_regs.is_empty() {
+        println!("cargo:rustc-cfg=clock_mux");
+
+        let struct_fields: Vec<_> = rcc_cfgr_regs
+            .iter()
+            .map(|(_fieldset, fieldname, enum_name)| {
+                quote! {
+                    pub #fieldname: Option<#enum_name>
+                }
+            })
+            .collect();
+
+        let field_names: Vec<_> = rcc_cfgr_regs
+            .iter()
+            .map(|(_fieldset, fieldname, _enum_name)| fieldname)
+            .collect();
+
+        let inits: Vec<_> = rcc_cfgr_regs
+            .iter()
+            .map(|(fieldset, fieldname, _enum_name)| {
+                let setter = format_ident!("set_{}", fieldname);
+                quote! {
+                    match self.#fieldname {
+                        None => {}
+                        Some(val) => {
+                            crate::pac::RCC.#fieldset()
+                                .modify(|w| w.#setter(val));
+                        }
+                    };
+                }
+            })
+            .collect();
+
+        let enum_names: BTreeSet<_> = rcc_cfgr_regs
+            .iter()
+            .map(|(_fieldset, _fieldname, enum_name)| enum_name)
+            .collect();
+
+        g.extend(quote! {
+            pub mod mux {
+                #(pub use crate::pac::rcc::vals::#enum_names as #enum_names; )*
+
+                #[derive(Clone, Copy)]
+                pub struct ClockMux {
+                    #( #struct_fields, )*
+                }
+
+                impl Default for ClockMux {
+                    fn default() -> Self {
+                        Self {
+                            #( #field_names: None, )*
+                        }
+                    }
+                }
+
+                impl ClockMux {
+                    pub fn init(self) {
+                        #( #inits )*
+                    }
+                }
+            }
+        });
+    }
+
     // Generate RCC
     clock_names.insert("sys".to_string());
     clock_names.insert("rtc".to_string());
diff --git a/embassy-stm32/src/rcc/f013.rs b/embassy-stm32/src/rcc/f013.rs
index c2933186c..de209272d 100644
--- a/embassy-stm32/src/rcc/f013.rs
+++ b/embassy-stm32/src/rcc/f013.rs
@@ -97,8 +97,9 @@ pub struct Config {
     pub adc: AdcClockSource,
     #[cfg(all(stm32f3, not(rcc_f37), adc3_common))]
     pub adc34: AdcClockSource,
-    #[cfg(stm32f334)]
-    pub hrtim: HrtimClockSource,
+
+    #[cfg(clock_mux)]
+    pub mux: crate::rcc::mux::ClockMux,
 
     pub ls: super::LsConfig,
 }
@@ -122,13 +123,13 @@ impl Default for Config {
             // ensure ADC is not out of range by default even if APB2 is maxxed out (36mhz)
             adc_pre: ADCPrescaler::DIV6,
 
-
             #[cfg(all(stm32f3, not(rcc_f37)))]
             adc: AdcClockSource::Hclk(AdcHclkPrescaler::Div1),
             #[cfg(all(stm32f3, not(rcc_f37), adc3_common))]
             adc34: AdcClockSource::Hclk(AdcHclkPrescaler::Div1),
-            #[cfg(stm32f334)]
-            hrtim: HrtimClockSource::BusClk,
+
+            #[cfg(clock_mux)]
+            mux: Default::default(),
         }
     }
 }
@@ -347,7 +348,8 @@ pub(crate) unsafe fn init(config: Config) {
         }
     };
 
-    #[cfg(stm32f334)]
+    /*
+    TODO: Maybe add something like this to clock_mux? How can we autogenerate the data for this?
     let hrtim = match config.hrtim {
         // Must be configured after the bus is ready, otherwise it won't work
         HrtimClockSource::BusClk => None,
@@ -363,6 +365,10 @@ pub(crate) unsafe fn init(config: Config) {
             Some(pll * 2u32)
         }
     };
+     */
+
+    #[cfg(clock_mux)]
+    config.mux.init();
 
     set_clocks!(
         hsi: hsi,
@@ -378,8 +384,6 @@ pub(crate) unsafe fn init(config: Config) {
         adc: Some(adc),
         #[cfg(all(stm32f3, not(rcc_f37), adc3_common))]
         adc34: Some(adc34),
-        #[cfg(stm32f334)]
-        hrtim: hrtim,
         rtc: rtc,
         hsi48: hsi48,
         #[cfg(any(rcc_f1, rcc_f1cl, stm32f3))]
diff --git a/embassy-stm32/src/rcc/mod.rs b/embassy-stm32/src/rcc/mod.rs
index 0f3467151..c8ca713de 100644
--- a/embassy-stm32/src/rcc/mod.rs
+++ b/embassy-stm32/src/rcc/mod.rs
@@ -31,6 +31,8 @@ mod _version;
 
 pub use _version::*;
 
+#[cfg(clock_mux)]
+pub use crate::_generated::mux;
 pub use crate::_generated::Clocks;
 
 #[cfg(feature = "low-power")]
diff --git a/examples/stm32f334/src/bin/pwm.rs b/examples/stm32f334/src/bin/pwm.rs
index 7fc1ea926..7c6d6cd71 100644
--- a/examples/stm32f334/src/bin/pwm.rs
+++ b/examples/stm32f334/src/bin/pwm.rs
@@ -27,7 +27,8 @@ async fn main(_spawner: Spawner) {
         config.rcc.ahb_pre = AHBPrescaler::DIV1;
         config.rcc.apb1_pre = APBPrescaler::DIV2;
         config.rcc.apb2_pre = APBPrescaler::DIV1;
-        config.rcc.hrtim = HrtimClockSource::PllClk;
+
+        config.rcc.mux.hrtim1sw = Some(embassy_stm32::rcc::mux::Timsw::PLL1_P);
     }
     let p = embassy_stm32::init(config);