I can't find the LMX2322 on National Semi site.
Can someone tell me a suitable replacement as I just need the 64x prescaler
function.

Thanks

JE

Not much feedback.
Anyone suggest a prescaler, preferably hard wired to divide by say 64?

JE

JE wrote:
Not much feedback.
Anyone suggest a prescaler, preferably hard wired to divide by say 64?

You could use a small CPLD.

73, Leon

"JJ" skrev i en meddelelse
...
I can't find the LMX2322 on National Semi site.
Can someone tell me a suitable replacement as I just need the 64x
prescaler
Hi..
have a look here.
http://hem.passagen.se/communication/component.html
oz1lqb

Great. I found the LMX2346 is a newer part and pin for pin compatible.
Is there a simple primer on how to program this thing?
I know there is the datssheet but it is a bit complicated, I am also trying
to learn the PIC16F870.

JE

I can't find the LMX2322 on National Semi site.
Can someone tell me a suitable replacement as I just need the 64x
prescaler
Hi..
have a look here.
http://hem.passagen.se/communication/component.html
oz1lqb

In article , says...
Great. I found the LMX2346 is a newer part and pin for pin compatible.
Is there a simple primer on how to program this thing?
I know there is the datssheet but it is a bit complicated, I am also trying
to learn the PIC16F870.

JE



If all you need is a /64 prescaler, then you shouldn't need to program
anything, with a PIC or otherwise. (Hint: ditch the PIC and move to
Atmel, where there's a nice free C/C++ compiler for the Googling).

Those LMX parts do a lot more than just divide. Have you tried punching
"prescaler" into the search boxes at digikey.com and mouser.com? It
could save quite a bit of work with a chip that's not exactly right for
your needs...

-- jm

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Another great idea thanks.Lots to choice from NEC. Why don't US companies
make prescalers?
Where do I get this free C/C++ compiler and which Atmel chips do you
recommend to start?

JE

In article ,
says...
Another great idea thanks.Lots to choice from NEC. Why don't US companies
make prescalers?

I think On Semiconductor (formerly Motorola) might be your only choice
there; not sure they're still in the business. There's also California
Eastern Labs (www.cel.com), but they may just be reselling NEC parts.
Not super-familiar with the prescaler world these days.

Where do I get this free C/C++ compiler and which Atmel chips do you
recommend to start?

Atmel partisans tend to favor the "WinAVR" distribution of avr-gcc (
http://www.avrfreaks.net/AVRGCC/ , or just Google for avr-gcc or winavr
). There are also commercial compilers for the chip, but I don't know
anything about them.

I usually use the ATmega128 for everything, out of laziness. In the
past, I've also compiled my hybrid synth driver (LMX/ADF-series PLL
control, plus DDS control, plus 2-line LCD and numeric-keypad UI) on the
ATmega32. This is the most capable Atmel chip that's still available in
a 40-pin DIP. Flash memory space was a bit cramped, but there's a lot
you can do to optimize the generated code when things get tight. (I
have a bad habit of using 64-bit ints for timers and such, and that
costs a LOT of code space on an 8-bit controller.)

If all you want to do is program the prescaler section of a PLL chip,
I'm sure the cheapest/smallest TinyAVR chip supported by GCC would do
just fine.

The C/C++ learning curve isn't too bad, because the platform limitations
will rule out many of the fancier C++ language constructs. Straight
ANSI C advocates will be very happy campers. The obvious advantage to
writing C on your microcontroller is that the time spent on the learning
curve won't be wasted if/when you move to a new microcontroller family.
Contrary to conventional wisdom, you will NOT end up having to learn AVR
assembly anyway to debug your design. The compiler works great.

There's nothing worse than people who go around bellowing "My CPU is
better than your CPU!," but I hate to see people spending valuable time
learning a dead-end language like PIC assembly for one-off projects.

-- jm

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What is the cheapest AVR that will work for me?
And is there a programmer you can build or just modify the pic ones?

I already know C so should be easy learning.

JE

In article ,
says...
What is the cheapest AVR that will work for me?
And is there a programmer you can build or just modify the pic ones?

I already know C so should be easy learning.

JE



I'd probably look at the specs of the lower-end chips that support AVR-
GCC. Some of them (ATtiny11L) don't even have any on-chip RAM, which
makes me wonder how the stack works.

The difference in cost between the low and high end of the ATtiny range
is only about $2.00, so I wouldn't waste time trying to make the cheaper
parts work unless I were going to build 1000+ of whatever I was working
on. The ATtiny45V sounds good, and DigiKey has 'em in stock (ATTINY45V-
10PI-ND).

I know a lot of people use the AVRDude programmer
(http://www.bsdhome.com/avrdude/), which apparently now works under both
*nix and Win32. I use an STK-500 programmer myself, but those are
fairly pricy even on eBay. Lots of options out there.

-- jm

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