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CCS/MSP430FR5969: Timer A, is there an ISR respond to COV flag

Aladdin
Prodigy 150 points
Part Number: MSP430FR5969

Tool/software: Code Composer Studio

Hello all, 

I just have a small question about the flag COV.

I want to know which interrupt is responding to the COV flag in the timer. Is the TAIFG respond to this flag as well and hence it causes timer ISR?

Thanks a lot for your help

  • 0
    Guru 99455 points
    COV in itself does not trigger an interrupt. A COV rising edge is always accompanied by the corresponding CCIFG. [See also FR59 User Guide (SLAU367o) Fig 25-11]
  • 0 in reply to Bruce McKenney
    Prodigy 150 points
    There is something missing in the equation. Timer0_A3 Capture/Compare Control 1 register TA0CCTL1, whenever an interrupt occured, I noticed COV is showing over flow. According to the figure Figure 25-11, it states that COV will not happen if the capture read. What is that means?
    I am just confused. I understand that COV need CCIFG to happen, but is it possible for CCIFG to trigger without COV?. Acording to the Figure 25-11, it can happen if captrue read which is not clear!!!
  • 0 in reply to Aladdin
    Guru 99455 points
    There are three indicators here:
    1) CCIFG: cleared only by software
    2) CCR-stored-but-not-read: this is invisible, but is cleared by reading the CCR
    3) COV: cleared only by software

    where:

    A) Setting (2) triggers (1)
    B) Setting (2) when (2) is already set triggers (3)

    C) Clearing (1) does not clear (2) or (3)
    D) Clearing (2) does not clear (1) or (3)
    E) Clearing (3) does not clear (1); curiously enough it does clear (2) [That's the circle to the far left]

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