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MSP430FG4618: SMCLK stops on Code Composer Studio breakpoint

Part Number: MSP430FG4618

What mechanism is it that causes the SMCLK to stop when Code Composer Studio hits a breakpoint or you use the "pause" button?  I have BOTH the MCLK and SMCLK set to be driven by DCO/1, and I have ACLK, MCLK, and SMCLK directed to device pins (P1.5, P1.2, and P1.6, respectively) but whenever Code Composer Studio hits a breakpoint or I use the "pause" button, I see that only ACLK and MCLK continue to run, while SMCLK stops.  What is it that causes this behavior?

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