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Morgan Meader

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    Morgan Meader reacted to pabigot in Timer initialization and external oscillator problem   
    You may be selecting the source before it stabilizes, causing it to fall back to an alternative source. Make sure XT2OFFG is clear in UCSCTL7. The TI example program msp430x54x_UCS_8 from the 5418 example programs shows how to configure for XT2 and includes the loop below; there's probably an equivalent one for your chip in the code examples available at http://www.ti.com/product/msp430f5510#toolssoftware.

    // Loop until XT1,XT2 & DCO stabilizes do { UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + XT1HFOFFG + DCOFFG); // Clear XT2,XT1,DCO fault flags SFRIFG1 &= ~OFIFG; // Clear fault flags }while (SFRIFG1&OFIFG); // Test oscillator fault flag UCSCTL6 &= ~XT2DRIVE0; // Decrease XT2 Drive according to expected frequency UCSCTL4 |= SELS_5 + SELM_5; // SMCLK=MCLK=XT2
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