How to detect low battery in battery powered F683 circuit

[tekart]

Wow. Thanks Mark - I missed that. I just HATE all these whiz bang "features" that force us mere mortal coders to spend *days* learning a new chip! Grrrr. <end rant>
SO to implement a pin as output only I use:
GreenLED var lata.1 ' high = light power LED
and also set:
' config
TRISa = %011001 ' set I/O directions (0 = output, 1 = input)
LATa = %011001

- still not getting it to work with above settings. Do I have bit polarity right for LATA?

[mark_s]

I think you would declare your variable as

GreenLED var PORTA.1

[tekart]

I think you would declare your variable as
GreenLED var PORTA.1

Been testing that and the compiler seems to accept either
GreenLED var PORTA.1
or
GreenLED var LATA.1

[mark_s]

At this point without posting your complete code it's hard to guess what's wrong.

[tekart]

Got all the OUTPUTS working fine - no need for LATA configurations apparently. Struggling with some kind of hardware bug - so I'm basically good. No idea how or why I would configure LATA at this point as it all seems to work fine without any direct reference to it.

[flotulopex]

Maybe this application note from MICROCHIP can help ;-)

[peterdeco1]

I did this a long time ago with a 6V circuit. The pic was running from the battery (with a series diode = 5.4V) but there was a 3.3V regulator elsewhere on the circuit board. I ran a jumper wire from an ADC pin to the 3.3V reference voltage. As the battery voltage begins to drop, the ADC reading will begin to rise. When the ADC reading reached the desired point, the SOUND command alerted you.