Reply by Steven Cornett ●January 30, 20032003-01-30

----- Original Message ----- >
> Message: 1
> Date: Wed, 29 Jan 2003 20:42:37 +0200
> From: "Nir Shelly" <>
> Subject: Use of TA3 in 56f805
>
> Hi all,
> I'm using the TA3 (pin of timer A)in order to trigger the timer A ch3.
After
> awhile, it looks like this pin became as an output and I'm wondering why.
> Included my initialization code:
>

I don't know, but the ISR looks a lot like something I tried to do with a
period
counter timer. I tried to turn off the timer and reset the thing inside the
ISR and
ended up with a timer that wouldn't update.

For some reason I don't quite understand, thing like this don't work very
well
inside the ISR. Perhaps you have to disable the timer interrupt first
before you
do this?

Steven P. Cornett > asm(movei #$0,x:TMRA3_LOAD);
> asm (move #$0,X:TMRA3_CNTR);
> asm(movei #$0001 ,x:TMRA3_CMP1);
> // asm(movei #$4640,x:TMRA3_CTRL);
> asm(movei #$47C0,x:TMRA3_CTRL);
> asm(movei #$4000,x:TMRA3_SCR); // Enable interrupt
>
> and the ISR:
>
> #pragma interrupt
> void Sense3Int(void)
> {
>
> asm(bfclr #$C000,x:TMRA3_SCR); // Clear TCF.
>
> asm(movei #$0,x:TMRA3_LOAD);
> asm (move #$0,X:TMRA3_CNTR);
> asm(movei #$0001,x:TMRA3_CMP1);
> asm(movei #$47C0,x:TMRA3_CTRL);
>
> asm(bftsth #$0100,x:TMRA3_SCR);
> asm(bcs LB3)
> SensStat |= 0x8;
> fader1[3]++;
> asm(bra SKP3);
> LB3:
> SensStat &= 0xFFF7;
> fader0[3]++;
> SKP3:
>
> asm(bfset #$4000,x:TMRA3_SCR);
> } > Any suggestions for this pin behavior?
>
> Thanks
> Nir Shelly
>