Steve Underwood wrote:
Hi Garst,
Garst R. Reese wrote:
I'm using ACLOCK to trigger a sequence of conversions every 250us.
This gives me an ADC12IFG when the sequence is complete. At present,
I turn off ENC and ADC12 before processing the data, and then turn on
ADC12 and ENC. There is no TimerA ISR active.
But, I'm wondering if I could use one to turn on the ADC12 and ENC.
This would keep the ADC12 off until it was needed and save a bit of
power.
Thoughts?
I have done that. It works OK. If you are using the voltage reference,
you have to leave that on all the time - it has a fairly long
stabilisation time. The SD16 converter has a much faster reference,
which might be usable in short pulses. Its a pity the ADC12 isn't the
same. That said, keeping the ADC12 off for half the time makes a
noticable difference to the overall consumption. The complexity of
achieving this is low. The timer interrupt routine you need is
trivial. It just ties up an extra timer channel to get the interrupt
at the right moment.
Regards,
Steve
Thanks Steve,
I wasn't too clear there ;) I am already using TimerA to supply the
start of sequence pulse.
ACLK is running at 40 kHz, so in UP mode, set-reset, I set on 9 and
reset on 10 counts.
so I think all I need to do is use the TimerA0_Vector for my ISR, which
will get the interrupt on the leading edge of that pulse. I'm using an
external reference which is already up.
I'll try it out.
Garst
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