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MSP430FR5739: MSP430 Timer Blocks: "EQU0" ... "EQUn" signals. What are they?

Adam Pasternak
Intellectual 620 points
Part Number: MSP430FR5739

If you look at the datasheet/user guide for many MSP430 devices, you'll see Timer_x blocks illustrated as well as their associated capture/compare registers. For example, Figure 11-1 from the MSP430FR57xx Family Users Guide.   In this diagram, we see references to these "EQU0" and "EQUn" signals all over the place, as well as in the timing diagrams for counters.

Well, the guide never explains anywhere what the origin of these signals are, where they come from, or what their nature even is. 

Thus I must ask:    What exactly is EQU0 ... EQUn ??? 

As a tangent to this question ... why do some output modes not matter "because EQU0 = EQUn" ?  What does this even mean?   

  • 0
    Guru 88460 points

    User Guide (SLAU272D) Fig 11-1 shows (as an example) EQU6 as the output from a comparator whose inputs are TAxR and TAxCCR6. I.e. it's a signal that TAxR has counted to be EQUal to CCRn.

    The ("real") PWM modes are defined to do one thing when TA0R=CCRn and another when TA0R=CCR0. If EQUn=EQU0, i.e. CCRn and CCR0 are the same (output from TA0.0), both events happen simultaneously, which is (Engineering term) "boring".

  • 0 in reply to Bruce McKenney47378
    Intellectual 620 points

    Thanks again Bruce.  

    Yes, I see the "EQU6" signal coming out of "Comparator 6" now in the diagram.   Thank you for elucidating these signals.  I thought at first the appearance of "EQU0" in the "CCR6" block diagram was an error, but when taking into account the output module's modes, it makes sense. 

    In that same diagram, Figure 11-1, the CCR6 block is shown with an "Output Unit 4"   Is this an error?  Should it not be "Output Unit 6" for CCR6?   Just wondering, maybe I'm being nitpicky here.  Just trying to be precise.   

  • 0 in reply to Adam Pasternak
    Guru 88460 points

    or maybe just "Output Unit" with no number. It does look like a typo, being scrunched together like that.

    You can submit a complaint using the link at the bottom of the document page. I've done that a few times, when I was no-kidding baffled by something.

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