diff --git a/ports/stm32/Makefile b/ports/stm32/Makefile
index fa0f1c5eb42c..49b5f6f114f6 100644
--- a/ports/stm32/Makefile
+++ b/ports/stm32/Makefile
@@ -437,14 +437,10 @@ HAL_SRC_C += $(addprefix $(STM32LIB_HAL_BASE)/Src/stm32$(MCU_SERIES)xx_,\
 	)
 endif
 
-ifeq ($(MCU_SERIES),$(filter $(MCU_SERIES),g0 g4))
-HAL_SRC_C += $(addprefix $(STM32LIB_HAL_BASE)/Src/stm32$(MCU_SERIES)xx_, hal_fdcan.c)
-endif
-
-ifeq ($(CMSIS_MCU),$(filter $(CMSIS_MCU),STM32H743xx STM32H747xx STM32H750xx STM32H7A3xx STM32H7A3xxQ STM32H7B3xx STM32H7B3xxQ))
-HAL_SRC_C += $(addprefix $(STM32LIB_HAL_BASE)/Src/stm32$(MCU_SERIES)xx_, hal_fdcan.c)
-else ifeq ($(MCU_SERIES),$(filter $(MCU_SERIES),f0 f4 f7 h7))
+ifeq ($(MCU_SERIES),$(filter $(MCU_SERIES),f0 f4 f7))
 HAL_SRC_C += $(addprefix $(STM32LIB_HAL_BASE)/Src/stm32$(MCU_SERIES)xx_, hal_can.c)
+else ifeq ($(MCU_SERIES),$(filter $(MCU_SERIES),g0 g4 h7))
+HAL_SRC_C += $(addprefix $(STM32LIB_HAL_BASE)/Src/stm32$(MCU_SERIES)xx_, hal_fdcan.c)
 else ifeq ($(MCU_SERIES),$(filter $(MCU_SERIES),l4))
 HAL_SRC_C += $(addprefix $(STM32LIB_HAL_BASE)/Src/Legacy/stm32$(MCU_SERIES)xx_, hal_can.c)
 $(BUILD)/$(STM32LIB_HAL_BASE)/Src/Legacy/stm32$(MCU_SERIES)xx_hal_can.o: CFLAGS += -Wno-error=cpp
diff --git a/ports/stm32/adc.c b/ports/stm32/adc.c
index 2df1bde19aa4..ba09c612d7cf 100644
--- a/ports/stm32/adc.c
+++ b/ports/stm32/adc.c
@@ -160,7 +160,8 @@
 #define VBAT_DIV (4)
 #elif defined(STM32G0) || defined(STM32G4)
 #define VBAT_DIV (3)
-#elif defined(STM32H743xx) || defined(STM32H747xx) || \
+#elif defined(STM32H723xx) || defined(STM32H733xx) || \
+    defined(STM32H743xx) || defined(STM32H747xx) || \
     defined(STM32H7A3xx) || defined(STM32H7A3xxQ) || \
     defined(STM32H7B3xx) || defined(STM32H7B3xxQ) || \
     defined(STM32H750xx)
diff --git a/ports/stm32/flash.c b/ports/stm32/flash.c
index 16af49c3cfb8..2cc6c390ba01 100644
--- a/ports/stm32/flash.c
+++ b/ports/stm32/flash.c
@@ -133,7 +133,14 @@ static const flash_layout_t flash_layout[] = {
 #error Unsupported processor
 #endif
 
-#if (defined(STM32L4) && defined(SYSCFG_MEMRMP_FB_MODE)) || defined(STM32H7)
+#if defined(STM32H723xx)
+
+// get the bank of a given flash address
+static uint32_t get_bank(uint32_t addr) {
+    return FLASH_BANK_1;
+}
+
+#elif (defined(STM32L4) && defined(SYSCFG_MEMRMP_FB_MODE)) || defined(STM32H7)
 
 // get the bank of a given flash address
 static uint32_t get_bank(uint32_t addr) {
diff --git a/ports/stm32/machine_adc.c b/ports/stm32/machine_adc.c
index 1a478cd1cffb..34319e975332 100644
--- a/ports/stm32/machine_adc.c
+++ b/ports/stm32/machine_adc.c
@@ -315,7 +315,13 @@ STATIC void adc_config_channel(ADC_TypeDef *adc, uint32_t channel, uint32_t samp
     #if defined(STM32H7A3xx) || defined(STM32H7A3xxQ) || defined(STM32H7B3xx) || defined(STM32H7B3xxQ)
     ADC_Common_TypeDef *adc_common = ADC12_COMMON;
     #elif defined(STM32H7)
+    #if defined(ADC_VER_V5_V90)
+    if (adc != ADC3) {
+        adc->PCSEL_RES0 |= 1 << channel;
+    }
+    #else
     adc->PCSEL |= 1 << channel;
+    #endif
     ADC_Common_TypeDef *adc_common = adc == ADC3 ? ADC3_COMMON : ADC12_COMMON;
     #elif defined(STM32L4)
     ADC_Common_TypeDef *adc_common = ADCx_COMMON;
diff --git a/ports/stm32/main.c b/ports/stm32/main.c
index 511da7d8afb6..e5ad14fcf770 100644
--- a/ports/stm32/main.c
+++ b/ports/stm32/main.c
@@ -379,8 +379,10 @@ void stm32_main(uint32_t reset_mode) {
     // Enable D2 SRAM1/2/3 clocks.
     __HAL_RCC_D2SRAM1_CLK_ENABLE();
     __HAL_RCC_D2SRAM2_CLK_ENABLE();
+    #if defined(__HAL_RCC_D2SRAM3_CLK_ENABLE)
     __HAL_RCC_D2SRAM3_CLK_ENABLE();
     #endif
+    #endif
 
     MICROPY_BOARD_EARLY_INIT();
 
diff --git a/ports/stm32/powerctrl.c b/ports/stm32/powerctrl.c
index 498fb79d71c8..0ab80b487a67 100644
--- a/ports/stm32/powerctrl.c
+++ b/ports/stm32/powerctrl.c
@@ -33,11 +33,9 @@
 
 #if defined(STM32H7)
 #define RCC_SR          RSR
-#if defined(STM32H743xx) || defined(STM32H750xx)
-#define RCC_SR_SFTRSTF  RCC_RSR_SFTRSTF
-#elif defined(STM32H747xx)
+#if defined(STM32H747xx)
 #define RCC_SR_SFTRSTF  RCC_RSR_SFT2RSTF
-#elif defined(STM32H7A3xx) || defined(STM32H7A3xxQ) || defined(STM32H7B3xx) || defined(STM32H7B3xxQ)
+#else
 #define RCC_SR_SFTRSTF  RCC_RSR_SFTRSTF
 #endif
 #define RCC_SR_RMVF     RCC_RSR_RMVF
@@ -48,6 +46,8 @@
     defined(STM32H7B3xx) || defined(STM32H7B3xxQ)
 // TODO
 #define POWERCTRL_GET_VOLTAGE_SCALING() PWR_REGULATOR_VOLTAGE_SCALE0
+#elif defined(STM32H723xx)
+#define POWERCTRL_GET_VOLTAGE_SCALING() LL_PWR_GetRegulVoltageScaling()
 #else
 #define POWERCTRL_GET_VOLTAGE_SCALING()     \
     (((PWR->CSR1 & PWR_CSR1_ACTVOS) && (SYSCFG->PWRCR & SYSCFG_PWRCR_ODEN)) ? \
diff --git a/ports/stm32/usbd_conf.c b/ports/stm32/usbd_conf.c
index d0f519d45670..b6880da2d618 100644
--- a/ports/stm32/usbd_conf.c
+++ b/ports/stm32/usbd_conf.c
@@ -135,6 +135,26 @@ void HAL_PCD_MspInit(PCD_HandleTypeDef *hpcd) {
     if (hpcd->Instance == USB_OTG_HS) {
         #if MICROPY_HW_USB_HS_IN_FS
 
+        // Configure USB GPIO's.
+
+        #if defined(STM32H723xx)
+
+        // These MCUs don't have an alternate function for USB but rather require
+        // the pins to be disconnected from all peripherals, ie put in analog mode.
+
+        #if defined(MICROPY_HW_USB_OTG_ID_PIN)
+        const uint32_t otg_alt = GPIO_AF10_OTG1_FS;
+        #endif
+
+        mp_hal_pin_config(pin_A11, MP_HAL_PIN_MODE_ANALOG, MP_HAL_PIN_PULL_NONE, 0);
+        mp_hal_pin_config_speed(pin_A11, GPIO_SPEED_FREQ_VERY_HIGH);
+        mp_hal_pin_config(pin_A12, MP_HAL_PIN_MODE_ANALOG, MP_HAL_PIN_PULL_NONE, 0);
+        mp_hal_pin_config_speed(pin_A12, GPIO_SPEED_FREQ_VERY_HIGH);
+
+        #else
+
+        // Other MCUs have an alternate function for GPIO's to be in USB mode.
+
         #if defined(STM32H7A3xx) || defined(STM32H7A3xxQ) || defined(STM32H7B3xx) || defined(STM32H7B3xxQ)
         const uint32_t otg_alt = GPIO_AF10_OTG1_FS;
         #elif defined(STM32H7)
@@ -143,12 +163,13 @@ void HAL_PCD_MspInit(PCD_HandleTypeDef *hpcd) {
         const uint32_t otg_alt = GPIO_AF12_OTG_HS_FS;
         #endif
 
-        // Configure USB FS GPIOs
         mp_hal_pin_config(pin_B14, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, otg_alt);
         mp_hal_pin_config_speed(pin_B14, GPIO_SPEED_FREQ_VERY_HIGH);
         mp_hal_pin_config(pin_B15, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, otg_alt);
         mp_hal_pin_config_speed(pin_B15, GPIO_SPEED_FREQ_VERY_HIGH);
 
+        #endif
+
         #if defined(MICROPY_HW_USB_VBUS_DETECT_PIN)
         // Configure VBUS Pin
         mp_hal_pin_config(MICROPY_HW_USB_VBUS_DETECT_PIN, MP_HAL_PIN_MODE_INPUT, MP_HAL_PIN_PULL_NONE, 0);