Hi all, I am using the STR710 MCU from ST-microelectronics. To catch undefined program counter jumps to the SRAM I want to fill my hole SRAM with 0xFFFFFFFF(undefined instruction) before my C-program is entered. This way the unused (large) area of SRAM will not generate undefined behaviour when the possibly corrupted PC jumps to it. I think that the only way to do this is to clear SRAM in the Startup.s. But in the Startup.s I can only write assembly code and compiler bependent statements. Because I am not able to write this I have the following question: Does someone have an example, tips or a ready to use piece of assembly code that clears the hole SRAM(0 till 64kbyte starting at 0x20000000)with 0xFFFFFF that I can put in the Startup.s? Thanks, Erik