When I saw the P4.0 LED, I supposed you were using the Launchpad, but looking back I see you never said that. What platform are you using? The EM-18 data sheet I found said it runs at 5V (presumably logic as well). Does your platform have level shifters? Anyway, I see you've restarted the discussion over at https://e2e.ti.com/support/microcontrollers/msp430/f/166/t/821659
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