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'[EE]: MAX7651 future 8051 compatible product?'
2001\05\31@023423 by Jeff DeMaagd

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I have been getting the Maxim Analog Design Guides and similar mailings from
Maxim, the latest one has one about an 8051 compatible chip with an 8
channel muxed 12 bit ADC and two 8 bit "PWM DACs".  It has flash, which I
really like.  The copy said that there is an eval kit available.

I'm sticking with PICs for a while so I can learn them well for various
parts of electronics, but I want to keep my options open and keep informed.

Apparently the mailing caught the web maintainers off guard as the chips
don't show up even with the search.

My interest is piqued and I am curious if there is someone here that has
sources in or near Maxim that is at liberty to explain more about it, such
as availability dates and datasheets.

Thanks

Jeff

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2001\05\31@045030 by Bill Westfield

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   I have been getting the Maxim Analog Design Guides and similar mailings
   from Maxim, the latest one has one about an 8051 compatible chip with an
   8 channel muxed 12 bit ADC and two 8 bit "PWM DACs".  It has flash,
   which I really like.  The copy said that there is an eval kit available.

   Apparently the mailing caught the web maintainers off guard as the chips
   don't show up even with the search.

Presumably this would be a Dallas Semiconductor "cycle-enhanced" micro.
(Maxim bought Dallas.)  You could try their web site (http://www.dalsemi.com),
although I don't see it offhand.  The DS87C550 is pretty close, but the
A-D is only 10 bits, and there are 4x8bit PWM outputs.

BillW

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2001\05\31@053220 by Spehro Pefhany

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At 01:04 AM 5/31/01 -0400, you wrote:

>My interest is piqued and I am curious if there is someone here that has
>sources in or near Maxim that is at liberty to explain more about it, such
>as availability dates and datasheets.
>
If you do a web search for MAX7651 & 7651 you'll find some information on
"Future" products on the Maxim web site. Looks like 8K + 8K of flash
(roughly equivalent to a 12K PIC), based on a 4-cycle (vs. 12 or 6) 8051
core. Nice, and a nice step up from the AD products if they get into
production.

Best regards,
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2001\05\31@055101 by Brent Brown

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> I have been getting the Maxim Analog Design Guides and similar mailings from
> Maxim, the latest one has one about an 8051 compatible chip with an 8
> channel muxed 12 bit ADC and two 8 bit "PWM DACs".  It has flash, which I
> really like.  The copy said that there is an eval kit available.

Haven't heard of this one, but these have similar features:
Analog Devices ADuC812,824
Cygnal C8051Fxxx series

Regards,

Brent Brown
Electronic Design Solutions
16 English Street
Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/text: 025 334 069
eMail:  EraseMEbrent.brownspam_OUTspamTakeThisOuTclear.net.nz

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2001\05\31@082637 by michael brown

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FWIW Atmel makes some pretty nice 805x compatible chips.  Some of them can
be run "compatibility" mode (normal clocks cycles/instruction) or "turbo"
mode (fewer cycles/instruction).

Michael Brown
Instant Net Solutions
http://www.KillerPCs.net

{Original Message removed}

2001\05\31@132514 by Jeff DeMaagd

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----- Original Message -----
From: michael brown <@spam@n5qmgKILLspamspamAMSAT.ORG>


> FWIW Atmel makes some pretty nice 805x compatible chips.  Some of them can
> be run "compatibility" mode (normal clocks cycles/instruction) or "turbo"
> mode (fewer cycles/instruction).

I just checked a kit that I have.  About three years ago I bought & built
one of the 805x kits from iSigma that had Paul Mon.  Under the ID sticker I
found it was an Amtel logo on it.  I should look into using that kit as it
was a nice board, but at the time I was dealing with other frustrations.

Jeff

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2001\05\31@211319 by Brent Brown

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> FWIW Atmel makes some pretty nice 805x compatible chips.  Some of them can
> be run "compatibility" mode (normal clocks cycles/instruction) or "turbo"
> mode (fewer cycles/instruction).

I have used a couple of Atmel chips, and yes they are pretty nice
(not quite as nice as PIC's of course!). I didn't know they made fast
ones though, can I ask which ones have turbo mode? Thanks,

Brent Brown
Electronic Design Solutions
16 English Street
Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/text: 025 334 069
eMail:  RemoveMEbrent.brownTakeThisOuTspamclear.net.nz

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'[EE]: MAX7651 future 8051 compatible product?'
2001\06\01@040505 by Kashif Ali
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The maximum speed of Atmel AT89cxx uC are 24Mhz.
But you can find more then 24 Mhz in  ISSI-89Cxx uC family which are
8051
compatible same as AT89Cxx.

Kashif ali

Brent Brown wrote:

{Quote hidden}

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2001\06\01@105647 by michael brown

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> > FWIW Atmel makes some pretty nice 805x compatible chips.  Some of them
can
> > be run "compatibility" mode (normal clocks cycles/instruction) or
"turbo"
> > mode (fewer cycles/instruction).
>
> I have used a couple of Atmel chips, and yes they are pretty nice
> (not quite as nice as PIC's of course!). I didn't know they made fast
> ones though, can I ask which ones have turbo mode? Thanks,
>
> Brent Brown

(Now embarrassed, even though I'm sure I seen this on someone's 805x core)
The Atmel's use a 4 ticks per cycle vs. the original 12 ticks per cycle.
The Atmel's will run at up to 33 Mhz (8.25) mips or 40 Mhz depending on
where you look and what you believe.  Dallas semi also makes a single cycle
805x compatible proc. (DS89C420) that will run at 50 Mhz (50 Mips max) as
well as the 4 tick parts.  Some of the chips also contain a small amount
MOVX compatible ram.

It could be that I saw this selectable "turbo/compatibility" mode on a
Phillips core.  Although, I can't seem to find this anywhere now.  Since
some of these processors are advertised as "drop in" replacements, it stands
to reason that one would need the ability to set the processor into full
compatibility mode.  I did find that some cores have timers that will
operate using the normal 12 ticks/cycle but can be individually switch to 4
tick turbo mode.  I've looked at too many datasheets from too many
manufacturers now to remember where I ran into the register selectable turbo
mode.

BTW, one of my first microcontroller projects was a Basic-52 SBC using an
Atmel 89C52 (flash prog. loaded up with Intel BASIC) w/12 Mhz crystal,
Max232, a surplus 74HCTLS373 latch, a surplus Sony 58257P-12 32K SRAM, and
7805 reg. crammed on a RS 276-168B breadboard with lots of jumper wires.  No
rhyme or reason for the parts selection other than that's what I could find
at the local surplus outlet.  Works like a champ after I finally added a
reset circuit (these things are a little 'PIC'kier than a PIC).  I also had
to add an electrolytic cap to stop spontaneous resets.  I thought it was a
bad solder joint somewhere causing it to be sensitive to the touch, it
turned out (after hours of re-soldering and checking) that the 9V battery
clip was breaking contact a little.  It takes only a few uSecs of power
glitching to reset the cpu. ;-)  Live and learn.  The whole thing draws
about 25 mAmps including green power LED.  Now, all I need is something to
put it in. <grin>  I thought this was a pretty neat project since this
"computer" has more raw power than the $600.00 Trash-80 model 1 that I
learned to program on.  I probably had all of $15.00 in the project.

hope this helps

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2001\06\01@180050 by Brent Brown

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{Quote hidden}

Hi Michael,

Thaks for the info. Yes it's the new Philips ones that have the 6/12
selectable clock divider thingy. I looked up the Atmel architectural
overview data sheet and eventually found a reference to
instructions taking 1, 2 or 4us at 12MHz. That means the good old
divide by 12 scheme. I'm not saying "you're wrong ha ha!", just was
kind of hoping they had made some new developments! I know what
it's like looking over so many data sheets.

I still spec 8051's over PIC in some projects. I always add a reset
generator chip though, the PIC's are so much nicer this way. My
favourite big 8051 chip might be the Philips 89C51RD+, 64K Flash,
In Application Programmable etc, price about NZ$17 (US$7) for 1.
Winbond also have some good ones with fast execution, good price.
Dallas allways too dear, Cygnal ridiculously expensive.

My first micro board I made was a Philips 80c552 (68pin PLCC)
with a 8 or 32K RAM chip, 8/16/32K EPROM, 74HCT573 latch, 8 dip
switches, 8 LEDs, 2 x PWM outputs, 8 x analog inputs, buzzer, 5V
reg. I was lucky to do this at work and make this as a proper PCB. I
used an EPROM emulator to get code into it. The only fault I had
initially was I left out the earth track to the '573, very hard to fault
find! I was over the moon when my first "flash the LED" program
worked! The board still works and I have used it to test out many
code/hardware ideas.

Nice talking to you.

Brent Brown
Electronic Design Solutions
16 English Street
Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/text: 025 334 069
eMail:  brent.brownEraseMEspam.....clear.net.nz

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2001\06\01@182545 by Spehro Pefhany

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At 09:51 AM 6/1/01 -0500, you wrote:

>It could be that I saw this selectable "turbo/compatibility" mode on a
>Phillips core.

Yes, you were probably thinking of the _Philips_ cores, at least some of them
(the nice LPC series) run _12_ or _6_ clocks per cycle, the slower mode
being for
backward compatibility.

The original 8051 40-pin chips have an ugly "pseudo bidirectional" port
structure
that is to hate, and on-chip peripherals that are fairly primitive. OTOH,
the core
is fairly nice in all of them with built-in multiply and divide, overflow
flag,
and at least one 16-bit index register, and they all have interrupts with
multiple
vectors and an accessible stack.

Best regards,

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Spehro Pefhany --"it's the network..."            "The Journey is the reward"
EraseMEspeffspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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