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MSP430FR5969: Help using the ADC12B

Lauren Mayfield
Expert 7985 points
Part Number: MSP430FR5969


Hi team,

My customer is using this part and having issues. 

"

I’m working with the MSP430FR5969. I’m using the ADC12B and I want to use as an input trigger, a signal coming out of the Timer0.

The user Manual for the ADC12B says that 3 bits on ADC12CTL1 define the trigger input and it tells you to go to the datasheet to find possible inputs.

In the datasheet I find a table. This is the cut an paste with info from the two documents

 

I go back to the User manual and I find that I can use Timer0 that for this device, it has 3 Capture/Compare Registers associated.

 

This is the only drawing, so I have to assume that for my part, I have CCR0, CCR1 and

CCR2 …

I’m looking then for TA0 CCR1 … Is TA0 CCR1 the OUT1 signal. I see only 2 outputs from the capture/compare registers Outn  and the signal that sets the interrupt

Going back to the datasheet I find this table for TA0

You can see that there is an option to drive the ADC12B … Appears at the output as TA0.1 and it

Is called TA1  … but this is TA0 …

I’m hoping that TA0 CCR1 output is what is called TA1 and it goes to the ADC when I set the 3 bits to 001.

Do I need to setup something else? Can you clarify this further?

"

Can you provide further clarification on the terminology and how to accomplish using the ADC12B as an input trigger?

Thanks,

Lauren

  • +1
    TI__Genius 10060 points

    Hi Lauren,

    Please communicate this to the customer:

    You analysis is correct. As described in Table 6-13 in the datasheet setting ADCSHSx = 1 will select TA0.1 as the trigger source for ADC sampling. I think the confusion is coming from the fact that the column titled "Module Output Signal" refers to TA1. I admit the nomenclature could be more clear, but I think that "TA1" attempts to refer to output 1 of this TA instance which is TA0.

    Hope this helps.

    Regards,

    Evan

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