Counter not counting !!!

[Bruce]

Try this;

Mainloop:
TMR0 = 0 ' clear count before each pass
PAUSE 5000 ' give it some time to count pulses
Revs = TMR0 ' get TMR0 count
Counter = Counter + 1
LCDOUT $FE,1,"Counter1: ", DEC Counter
LCDOUT $FE,$C0, "Revs: ", DEC Revs
GOTO Mainloop

Counter of course is always going to change every 5 seconds or so, but Revs shouldn't until you have pulses in on RA4.

Timer0 will automatically count pulses. You don't need to check any regs, bits, etc, just read it & clear it as required.

[lerameur]

I did output the Revs and it increment without any input:
not as fast, takes about 2 seconds to get to ten.
The odd thing is that it increment without changes to RA4.
I am going to try your code you posted and be back later
thanks for your time

Mainloop:
TMR0 = 0 ' clear count before each pass

' output 8 clocks on RB0 to RA4/T0CKI
'instead, input from sensor


Revs = TMR0 ' get TMR0 count
Counter = Revs + 1
IF OPTION_REG.0 THEN
LCDOUT $FE,1,"Revs: ", DEC Revs
ELSE
lcdout $FE,$C0, "Counter2: ", DEC Counter
ENDIF
OPTION_REG.0 = OPTION_REG.0 ^ 1 ' toggle 1:4 or 1:2 prescale

GOTO Mainloop

end

[lerameur]

Hi again

I set my function generator to 100Hz and the Revs outputs 127, when I set it to 1000Hz, I get Revs 225 on my LCD.
I get a specific number to from different frequency input.

Ken

[Bruce]

That's a good sign. Higher frequency should = a higher count in a given time period.

FYI: You really don't need to keep flipping OPTION_REG.0. That was just a part of my
previous example to show the count difference with different prescaler values. I would
leve it set at one prescale if you want valid counts.