MSP430FR2433: Without ACLK in the UART of MSP430FR2433, how can SMCLK achieve low power consumption when sending and receiving communication?

Hello,

many thanks for your inquiry.

Though on various spots I have difficulties to understand your questions, thus please let me check my understanding ask the following questions:

Your post: MSP430FR2433 from LPM3 sleep state to active state, which register bit can indicate?

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Are you looking for the control bits controlling the operating modes of MSP430? Please checkout our documentation for such generic questions on the device functionality. The first document considering for this is always the device User's Guide, in this case it is the Please look into chapter 1.

Your post:

The crystal oscillator has started normally. The frequency of DCO16M we used should be ensured to ensure the normal start of the crystal oscillator before the next measurement data can be made

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What does DCO16M mean? What do you mean with "The frequency of DCO16M we used should be ensured"? Please elaborate on this in more detail, I have difficulties to understand what you're asking for.

Your post:

Without ACLK in the UART of MSP430FR2433

What do you mean by this? Does it mean you do not want to use ACLK, but SMCLK instead?

Your post:

how can SMCLK achieve low power consumption when sending and receiving communication?

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Please elaborate on what "low power" means to you, and also explain what yours/the customer's expectations are?

Your post:

There is no clear statement in this document.

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What kind of a statement are you expecting? In which document?

Your post:

Although it can communicate normally and consume low power, it does not conform to our cognition.

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Sorry, this is completely not understandable. Again, what are the customer's expectations here?

Best regards

Peter