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MSP430F2618 16 mhz xtal not working

Stan Ross
Prodigy 160 points

I recently changed the frequency of the xtal on the XIN(8) / XOUT(9) pins from 32.768khz to 16mhz, modified the BCSCTL1 to a value of 0x40 and no joy, the xtal does not oscillate. Any ideas?

  • 0
    Guru 92251 points

    Stan Ross said:
    I recently changed the frequency of the xtal on the XIN(8) / XOUT(9) pins from 32.768khz to 16mhz, modified the BCSCTL1 to a value of 0x40

    That sets the XTS bit which selects High-frequency mode for XT1.

    Have you also set the LFXT1Sx bits in BCSCTL3, which select the frequency range of the external xtal for XT1 high-frequency mode?

    At power-up the LFXT1Sx bits have the value of 00, which selects "0.4- to 1-MHz crystal or resonator".

    For a 16MHz xtal the LFXT1Sx bits need to be set to 10, which selects "3- to 16-MHz crystal or resonator".

  • 0
    Guru 227245 points

    In addition to the proper settings, did you atach teh proper load capacitors to the crystal?
    While an LF watch crystal can be provided with an internal load capacitance from the MSP, HF crystals require larger external capacitors.

  • 0 in reply to Jens-Michael Gross
    TI__Guru 64970 points

    Any news or update on the issues you were observing?

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