MSP430FR5962: Interrupts generated while switching from operation mode to LPM*.5

Expert 2831 points

Part Number: MSP430FR5962

Tool/software:

Hello,

May I have question about MSP430 interrupt and LPM*.5?

I think there is tiny time while switching from Active mode to LPM*.5.

If GPIO interrupt set to use for wake up, Is it work GPIO interrupt generate in this tiny time?

I think usually interrupt disable in this tiny time, but flag register will set.

So After done switching to LPM*.5, it will immidetary wake up.

Is this correct?

Thanks,

3 months ago

+1 Bruce McKenney47378 3 months ago

Guru 92770 points

The User Guide (SLAU367P) Sec 12.3.3 ("Note") describes such a window, and recommends setting GIE as part of the LPM setting step. I don't know why this isn't mentioned in Sec. 1.4.3.1 step 10.

0 GR 3 months ago in reply to Bruce McKenney47378

Expert 2831 points

Hi Bruce, exparts,

Thanks for your information.

If GPIO interrupt flag assert during 8 to 10 timing, I think GIE was cleard and this timing is before be LPM*.5.

So MSP430 can not wake up.

Is this correct?

If correct, Is there any way to wake up if GPIO interrupt assert in this timing?

Best regards,

+1 Bruce McKenney47378 3 months ago in reply to GR

Guru 92770 points

I read the Note in Sec 12.3.3 to say that Step 10 in Sec 1.4.3.1 should also set GIE. That's what I do, though I haven't done a controlled experiment.

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MSP430FR5962: Interrupts generated while switching from operation mode to LPM*.5