Commands and Instruction set Only the instruction register (IR) and the data register (DR) of the LCD can be controlled by the MCU.After instaling utility You must set up Your uVision project to use external tool for flashing MCU. We need to download STM32 ST-LINK utility which have GUI and command line tool for flashing MCU memory. Tutorials STM32F429I-DISCOVERY STM32VLDISCOVERY.Device ID:0x410 Device flash Size : 64 Kbytes Device family :STM32F10xx Medium-density Loading file.