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Which circuit you are referring too?By the way, how do I check the clock signal from the oscillator (inside the ucontroller) if I used external crystal oscillator to input to RA7 ?
What I mean is output from any where from the pins.
Which circuit you are referring too?
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You can buy ready built clock units pretty cheap, that just take power and give a squarewave,
I have had no problems with crystals recently (everything I've tried has worked!) but I did find that 2 chips wouldn't work above 4Mhz, so I'll say try a chip-swap 1st just in case, worth a try eh,
NEAL
---------- Post added at 13:39 ---------- Previous post was at 13:36 ----------
can you post a shot of the "Noise" you are measuring on the scope? Is there any pattern to it changing the trigger point?
Neal
is the noise 36.2 (read off scope) Mhz??
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This is what I mean, sorry I a bit pushed so this is UK site... 4pins, +, gnd , gnd and ~!!! :-D
NEAL
---------- Post added at 14:26 ---------- Previous post was at 14:25 ----------
Sorry, they are £100 each!!!! Cor, thats 75litres of Petrol...!!
Appologies, I expected them to be <£10
NEAL
---------- Post added at 14:30 ---------- Previous post was at 14:26 ----------
at 20mv I think you're right in thinking its noise... I presu,e this is the clock2 pin?
NEAL
---------- Post added at 14:31 ---------- Previous post was at 14:30 ----------
there is the OSCCON register to look at in code, if you're altering this directly it can set internal or external clock or crystals... Are you OK setting the config bits to make the chip use XT oscilator options?
NEAL
Measure the clock at clkout and GND not across clkin and clkout
this suggests a "PRE-BUILT osciliator module"... We're looking at a crystal resonator isn't it?if I used external crystal oscillator to input to RA7 ?