Tim Mitchell wrote:
> In article <bttfcr$v3k$1@ls219.htnet.hr>, MArk <marky@mark.com> writes
> 
>> If you weren't so lazy you would go to manufacturer site and download
>> the datasheets and compare them.
> 
> well, it would be handy if you could but some of the differences are not 
> clearly documented.


Or, you could go to the Atmel web, under
  Products   /  8051 Architecture   / App Notes

And find the one called
Migration from T89C51RD2 to AT89C51RD2/ED2   (16 pages, updated 6/03)

URL is
http://www.atmel.com/dyn/resources/prod_documents/doc4239.pdf

-jg

Tim Mitchell wrote:
> MArk <marky@mark.com> writes
> 
> > If you weren't so lazy you would go to manufacturer site and
> > download the datasheets and compare them.
>
> well, it would be handy if you could but some of the differences
> are not clearly documented.

When was the last time he ran diff on two .PDF files?

-- 
Chuck F (cbfalconer@yahoo.com) (cbfalconer@worldnet.att.net)
   Available for consulting/temporary embedded and systems.
   <http://cbfalconer.home.att.net>  USE worldnet address!

In article <bttfcr$v3k$1@ls219.htnet.hr>, MArk <marky@mark.com> writes
>If you weren't so lazy you would go to manufacturer site and download
>the datasheets and compare them.
well, it would be handy if you could but some of the differences are not 
clearly documented.
-- 
Tim Mitchell

In article 
<7GBLb.51605$AAe1.30709@news01.bloor.is.net.cable.rogers.com>, Rein 
Wiehler <rwiehler@netscape.net> writes
>andrew queisser wrote:
>
>> I've got a starter kit with a DIP 40 pin Atmel MC.
>> The part just says 89C51RD2-IM on it. Can I use
>> the newer AT89C51 versions as well? The software
>> seems to support it but I'm wondering if the pinout,
>> voltage levels, etc. are the same.
>>
>> Thanks,
>> Andrew Queisser
>
> pinout is the same, just watch for different functions, i.e. timers,
>registers, a/d, d/a etc, check power ranges and osc freq.
>rw

T89C51RD2 is the same as AT89C51ED2

*EXCEPT*
the eeprom write procedure is different
and the bootloader is in ROM, you have to map it in using the ENBOOT 
bit. Also the bootloader occupies more memory map than in the T..RD2
-- 
Tim Mitchell

If you weren't so lazy you would go to manufacturer site and download
the datasheets and compare them.

"Rein Wiehler" <rwiehler@netscape.net> wrote in message
news:7GBLb.51605$AAe1.30709@news01.bloor.is.net.cable.rogers.com...
> andrew queisser wrote:
>
> > I've got a starter kit with a DIP 40 pin Atmel MC.
> > The part just says 89C51RD2-IM on it. Can I use
> > the newer AT89C51 versions as well? The software
> > seems to support it but I'm wondering if the pinout,
> > voltage levels, etc. are the same.
> >
> > Thanks,
> > Andrew Queisser
>
>  pinout is the same, just watch for different functions, i.e. timers,
> registers, a/d, d/a etc, check power ranges and osc freq.
> rw

andrew queisser wrote:

> I've got a starter kit with a DIP 40 pin Atmel MC.
> The part just says 89C51RD2-IM on it. Can I use
> the newer AT89C51 versions as well? The software
> seems to support it but I'm wondering if the pinout,
> voltage levels, etc. are the same.
> 
> Thanks,
> Andrew Queisser

 pinout is the same, just watch for different functions, i.e. timers,
registers, a/d, d/a etc, check power ranges and osc freq.
rw

I did a Google and found this.  Ain't Google grand.


http://www.atmel.com/dyn/resources/prod_documents/doc4239.pdf



Jay


--
.
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.
"andrew queisser" <andrew.queisser@hp.com> wrote in message
news:3ffdc9c8$1@usenet01.boi.hp.com...
> I've got a starter kit with a DIP 40 pin Atmel MC.
> The part just says 89C51RD2-IM on it. Can I use
> the newer AT89C51 versions as well? The software
> seems to support it but I'm wondering if the pinout,
> voltage levels, etc. are the same.
>
> Thanks,
> Andrew Queisser
>
>

I've got a starter kit with a DIP 40 pin Atmel MC.
The part just says 89C51RD2-IM on it. Can I use
the newer AT89C51 versions as well? The software
seems to support it but I'm wondering if the pinout,
voltage levels, etc. are the same.

Thanks,
Andrew Queisser