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MSP430f2011 power on

xinguo zhang
Intellectual 320 points

when power on,there is a pulse of about 20us out of P26.

But due to the datasheet,P26 is Xin when power on.

what's the reson?

  • 0
    TI__Guru**** 202086 points
    Is there an external crystal connected to the XIN/XOUT (P2.6/P2.7) pins? Are you sure that this pulse is output from the MSP430 instead of an input coming from the crystal? P2.6/P2.7 are set to crystal functionality (XIN/XOUT) by default, so if a crystal is attached it will begin to oscillate during device power on and result in the pulse observed. You can deselect the crystal by clearing bits 6 and 7 of the P2SEL register.

    Regards,
    Ryan
  • 0
    TI__Guru**** 202086 points
    Has my response been sufficient in resolving your problem?

    Regards,
    Ryan

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