Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

### - u -

- UniqueDeviceId : property_store_t
- unlock_cmd_address_offset : SFLASH_CONFIGURATION_PARAM_PTR
- upperAddress : i2c_slave_config_t
- usbPid : bootloader_configuration_data_t
- usbStringsPointer : bootloader_configuration_data_t
- usbVid : bootloader_configuration_data_t
- userData : dspi_master_handle_t , dspi_slave_handle_t , flexcan_handle_t , i2c_master_handle_t , i2c_slave_handle_t , lpi2c_master_handle_t , lpi2c_slave_handle_t , lpsci_handle_t , lpspi_master_handle_t , lpspi_slave_handle_t , lpuart_handle_t , spi_master_handle_t , uart_handle_t