How can I establish what RAM I need...and therefore which PIC.

[mackrackit]

Say you have your code working on the 690. Look at the *.lst file near the end and see how much of what the code uses. Then dig through the specs from other chips to see what one is large enough.

[tenaja]

I use MicroCode Studio Plus... I think it tells you the memory used in the Status Bar.

[Acetronics2]

...

and MPLAB has the " memory usage gauge " ... in the " view " menu ...

Alain

[HankMcSpank]

Firstly my apologies....I thought I'd thanked you all, just come back to this thread to find I hadn't so Thank You!

Ok, so it seem 4096 words being used seems to be the 'significant' number wrt using a 16f690 ....anything more & I get compilation error messages.

So I started commenting out a few lines of code to see which commands are eating the word count.

By taking out about six (long) lines inserted randomly throughout my code as follows,.....

IF debug_active= 1 then DEBUG "below     pwm= ", DEC pwm_width," Target= ",DEC target," Sig= ", DEC signal_in, " Mode_status =", DEC mode, " On_Status = ", dec on_status, " AGC Status= ", dec Agc_on_status, 13, 10

(debug_active is just variable I use to erhmm activate/deactivate debug info out the debug port/pin)

......the words count used in my program plummets from around 4080-ish to about 1700 words?!!!

Can anyone explain why? (or have a good pop & accounting for the word plummet?!)

& while I'm on, which are the most hungry commands from using up the word space?

cheers,
Hank.