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MSP430F2619 - Disabling CPU causes 32kHz Crystal to drop out

Warren Woolsey
Intellectual 526 points

Hi All,

I am trying to use LPM2 with my application and I am having some trouble with my 32 kHz crystal. In my setup I am using the DCO to drive MCLK, and SMCLK at 16 MHz. I am using my 32 kHz crystal to source ACLK from the LFXT1 input.

I fire a 16138 kHz timer off of the ACLK input, and when I put my device to sleep, it wakes up off that timer. However.. when I disable the CPU, my crystal drops out. I looked at my crystal output on an OScope, and when the CPU is disabled, the output appears to have some kind of loading effect. Has anyone seen anything like this before?

I know that this only occurs if I disable the CPU, if I set SCG0 and SCG1 bits, the crystal behaves fine, its just when I set the CPU off bit that everything goes haywire.

Thanks,

Warren

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