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  • Cortex-M0+ core Hang up in FFFF FFFEh address when executing DSB instruction.

     Hi, I am porting FreeRTOS to my M0+ device now.

    I faced an issue CPU hang-up when DSB instruction executed.

    Then Program Counter showed "FFFF FFFEh" and Exc value of xpsr is 0x03. So, I knew Hard_Fault error interrupt is happened.

    But it has…