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MSP430FR6047: EVM-FR6047 Value displayed on LCD

Part Number: MSP430FR6047

Hi,

I have some question about EVM-FR6047.

I saw the ultrasonic Water Flow Meter Demonstration.

In video capture as below, the value displayed on LCD is negative.

What does this value mean?

My customer purchased an EVM-FR6047 and audiowell transducer, and when connected and running, a negative value was displayed as shown in the video.
 
He asked why the displayed value was negative.
I checked the MSP430FR6047EVM_USS_Water_Demo code, I don't know what this value is.
The example seems to display DTOF, AVG DTOF, DTOF STD, FLOW RATE.

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