The goal of this application note is to present a software technique for determining if data and program in FLASH have been corrupted and if so not to run the user program. The program described in this application note has been written for the ST72F26x family (ST72260G1, ST72262G1, ST72262G2, ST72264G1, ST72264G2) but can be extended to all other ST7 MCUs. In this application, we chose to use a ST72264G2.