MM5369 Replacement with PIC

[Ian R. Adlon]

I am looking for the code to replace an MM5369 oscillator with a PIC chip
(possibly something in the 12CXX series). I remember seeing the code on a
website sometime ago, but I can't find it now. I know elm makes one, but
I'd rather make it myself. Can anyone help?

 

[Michael A. Terrell]

"Ian R. Adlon" wrote:

I am looking for the code to replace an MM5369 oscillator with a PIC chip
(possibly something in the 12CXX series). I remember seeing the code on a
website sometime ago, but I can't find it now. I know elm makes one, but
I'd rather make it myself. Can anyone help?

Why does it have to be a PIC? You can use a crystal oscillator and
cmos divider chain to get the 60 Hz, 100 Hz, or whatever frequency you
needed.

There were different types of the MM5369, with different output
frequencies.

I have seen metal can crystal oscillators with a 60 HZ out in some
VCRs, they are in a round can with two rows of three pins.

--
We now return you to our normally scheduled programming.

Take a look at this little cutie! ;-)
http://home.earthlink.net/~mike.terrell/photos.html

Michael A. Terrell
Central Florida

 

[Dan T]

what output frequency you after?, you won't get a real high frequency out of
a PIC. i've recently finished a big project working with PICs, generating
wave forms, ...with a external clock frequency of 4MHz, the best output i
could get was little over 100Hz. Decresing the quality of the output you
could possibly get it to go a bit faster.


"Ian R. Adlon" <blues.pwr@verizon.net> wrote in message
news:sxhLb.43$CL2.4@nwrdny02.gnilink.net...

I am looking for the code to replace an MM5369 oscillator with a PIC chip
(possibly something in the 12CXX series). I remember seeing the code on a
website sometime ago, but I can't find it now. I know elm makes one, but
I'd rather make it myself. Can anyone help?

 

[Ian R. Adlon]

I'm only looking for three outputs: 50Hz, 60Hz, and 1Hz.


"Dan T" <d.twining@btinternet.com> wrote in message
news:btkuhi$30o$1@titan.btinternet.com...

what output frequency you after?, you won't get a real high frequency out
of
a PIC. i've recently finished a big project working with PICs, generating
wave forms, ...with a external clock frequency of 4MHz, the best output i
could get was little over 100Hz. Decresing the quality of the output you
could possibly get it to go a bit faster.


"Ian R. Adlon" <blues.pwr@verizon.net> wrote in message
news:sxhLb.43$CL2.4@nwrdny02.gnilink.net...
I am looking for the code to replace an MM5369 oscillator with a PIC
chip
(possibly something in the 12CXX series). I remember seeing the code on
a
website sometime ago, but I can't find it now. I know elm makes one,
but
I'd rather make it myself. Can anyone help?

 

[Thomas C. Sefranek]

"Ian R. Adlon" <blues.pwr@verizon.net> wrote in message
news:aJpLb.613$sU2.322@nwrdny01.gnilink.net...

I'm only looking for three outputs: 50Hz, 60Hz, and 1Hz.

Well, it's an easy thing for a small PIC as you know.
YOU should learn how to program a 12C519.

Use the timer to generate hardware time tics, the units of your frequency
requirements.
Use software timers updated by the timer IRQ, to generate the various
outputs.

Microchip supplies the assembler free. This is a great learning
opportunity.
I won't hand you the code, but I will assist YOU learning.

Tom
--
*
| __O Thomas C. Sefranek WA1RHP@ARRL.net
|_-\<,_ Amateur Radio Operator: WA1RHP
(*)/ (*) Bicycle mobile on 145.41, 448.625 MHz

http://hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org

 

[Robert C Monsen]

"Ian R. Adlon" <blues.pwr@verizon.net> wrote in message
news:sxhLb.43$CL2.4@nwrdny02.gnilink.net...

I am looking for the code to replace an MM5369 oscillator with a PIC chip
(possibly something in the 12CXX series). I remember seeing the code on a
website sometime ago, but I can't find it now. I know elm makes one, but
I'd rather make it myself. Can anyone help?

There is lots of timing code available on www.piclist.com

If you just need a squarewave output, then a PIC is easy to program, using
example code from microchip and piclist.

Regards