Hi,
We where using the Rev A of the MSP430F5659 and everything worked fine, we lately moved to the Rev B. and the boards are not working correctly means that the SW is stuck, is there any reason for that? any differences between the Rev A and B?
We are using external 19.2MHz clock, the SW is working fine with the internal clock but when moving to the external (XT2) the SW is stuck,
Many Thanks,
HRi
Hello,
For differences between device revisions, you can refer to the erratasheet which can be found on the device's product folder.
Looking at the erratasheet, Rev B seems to have fixed two errata from Rev A, but these fixes don't seem to be related to XT2. So, assuming your board layout and components are the same and only the MSP430F5659 Rev B has been swapped for Rev A, I suspect that your effective load capacitance for XT2 was at the limit and the Rev B device may have slightly lower or higher integrated load capacitance than Rev A devices. According to the datasheet, this integrated load capacitance is approximately (or typically) 1pF.
In your code, it's probably getting halted where it's checking the XT2 oscillator fault flag which could be set due to incorrect load capacitance. I would double-check your external load capacitors for XT2 are correct. A great reference is the MSP430™ 32-kHz Crystal Oscillators app note.
Also, make sure the XT2DRIVE bits select the frequency range of operation of XT2.
Regards,
James
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