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Hi all,

I am having hard time to make rpm routine to work correctly. I am using 12F=
683=20
pic and CCP input is connected to=20
a generator. every 4th pulse is 1 cycle. for some reason I am unable to put=
 the=20
pic in debug mode just because of=20
that reason I used on/off delay routine to check CCP. Now I am getting outp=
ut=20
using scope but the problem
I am seeing is going below 65 Hz the output is unstable and result either s=
hows=20
low number or if I go even lower like 50 hz the output frequency starts jum=
ping=20
higher kind of strange. I can tell 65 Hz or higher is stable. In the code I=
 also=20
made dwell control routine that looks like working fine if I manually enter=
 the=20
value to test.
I know one thing that delay routines without using timer will waist process=
or=20
cycle. I am kind of suspecting that this kind of test is not a valid method=
..
My question is how can I calculate if I do not even know what value I am ge=
tting=20
from CCP. based on scope result input is 90 hz and CCP output I am
getting is 35.9 hz. just to make sure I just tried another frequency input =
is=20
930 hz and output CCP using delay routine generates  358.4 hz.
I am not sure if I explained clearly.=20
just to make things more clear I have to choose 16 different RPM settings a=
nd=20
based on that change the dwell on time. at this moment the routine is
off I am not even there yet.


any help will appreciate.

see attachment file. thanks

Andre



      =

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