[time-nuts] Frequency Dividers
Didier Juges
didier at cox.net
Thu Aug 10 03:27:39 UTC 2006
Hi Said,
Thanks for the info, I did check the Philips (and Sparkfun) web site(s)
and I must admit the ARM chip is cheap and has impressive
specifications. With the GNU tools, I know it will work and it will fit
my homebrewer's budget :-) I used to consider $99 for a development kit
cheap, but $29 beats it with good margin.
At that price, I don't see how I could pass on a chance to evaluate it,
if not for the fact that I have so much 8051 code (and a Franklin
compiler, wich is similar to the Keil)
I agree that the Silab chips are somewhat expensive, at least for high
volume consumer stuff. However, I do not consider 64k of Flash memory
(and several kB of RAM for most parts) as small for an 8 bit micro, but
there again, if you are considering applications that require large
buffers, such as data compression, you probably would not want to use an
8 bit chip anyhow. Also, on the 8051, addressing RAM above the customary
128 bytes of DATA space (XDATA) takes a lot longer. On the 8051, RAM is
not always equal :-)
Thanks again.
Didier KO4BB
SAIDJACK at aol.com wrote:
> In a message dated 8/8/2006 19:51:06 Pacific Daylight Time, didier at cox.net
> writes:
>
> Hi Didier,
>
> I used their 8051F310 in many devices, it's a great little chip :)
>
> There are two issues that made me change to the Philips LPC2000 Arms though:
> the SIL parts are somewhat expensive, and they don't have much memory,
> especially SRAM. For the Arm's, there are GNU compilers (no need to pay Keil), and
> a bunch of great open-source RTOS'.
>
> Also, the Arm's are extremely low-power, and run up to a true 60Mips at 32
> bits. Plus they have lot's of memory and code compression (Thumb mode).
>
> Then there is Olimex and Sparkfun, they sell these Arms very cheap. Last
> time I checked, SIL wanted to have $99 for an 8051F310 eval kit - the Arm starts
> at $29.99 at Sparkfun - no need to buy any software development tools for the
> Arm either.
>
> Philips has parts with up to 512KB internal Flash and at least 64Kbytes SRAM
> I believe, some of them pin-compatible to each other.
>
> On the PLL: Philips typically does very well on their PLL's - jitter is very
> low. Certainly I've seen some of their PLL's in the ps range, which would
> put the 1PPS output at probably better than 1E-11, 1s accuracy. I can measure
> the unit I have, and let you know later...
>
> bye,
> Said
>
>
>
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