ST STM32U3

The ST STM32U3 series are 32-bit ultra low power microcontrollers based on the ARM Cortex-M33 processor.

Flash Banks

STM32U385xG and STM32U375xG

Flash Bank	Base address	J-Link Support	Loader
			Name	Size
Non-Secure Internal Flash	0x08000000		Default	1 MB
Secure Internal Flash	0x0C000000		Default	1 MB

Watchdog Handling

• The device has a watchdog IWDG.
• The watchdog is fed during flash programming.

Device Specific Handling

Reset

• The device uses normal Cortex-M reset, no special handling necessary, like described here.

Option byte programming

Option byte programming is implemented in Device Provisioner utility: ST STM32U3 Option Bytes Programming.

Disabling readout protection

J-Link Commander and J-Flash automatically detect secured STM32U3 devices and ask the user if it should be unlocked.
If a password for the RDP regression was configured, J-Link Commander and J-Flash cannot automatically disable readout protection.
In that case the Device Provisioner utility: ST STM32U3 Option Bytes Programming can be used.
For further information please refer to the generic STM32 article.

Evaluation Boards

• ST NUCLEO-U385RG-Q

Example Application

• ST NUCLEO-U385RG-Q