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TMS320F28377D: Will the device reset repeatedly when powered without any program loaded?

Howard Zou
Genius 12365 points
Part Number: TMS320F28377D

Hi,

my customer would observe repeatedly low on XRS pin when powered up a purely new(unprogrammed) F28377d, which means it's resetting repeatedly.

Is this what should be observed?

If yes, is it caused by watchdog reset?

If not, why? Since in our reference code, we would always disable the watchdog in codestartbranch.asm. Why without loading any program, the device will not enter watchdog reset?

  • 0
    TI__Guru** 115271 points

    Hi Zou,

    Is this what should be observed?

    If yes, is it caused by watchdog reset?

    Yes, this is expected. On un-programmed device if device boot to Flash then it'll fetch 0xFFFF_FFFF which is ITRP and ITRAP handler (in BOOTROM code) will enable watchdog to reset the device. To avoid this you should change the BOOTMODE pin setting to something other than "Get Mode" (which defaults to Flash BOOT).

    Regards,

    Vivek Singh