Hi David, thanks for looking into this and trying your experiment. The XDS110 (which runs at 3.3V) connected to the JTAG pins on a 1.8V msp432p401x turns out will power the msp432 to 3 volts through the JTAG I/O pins through the clamps that are put on i/o pins. So what happens is even though the msp432 is powered from a 1.8 V power supply when any of the jtag pins are at 3.3 V the chip will be powered at the higher level. this doesn't work for a 1.8V design.
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