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PICList Thread
'Micro-controller NEC D8749HD (8048 family) - Info '
1999\07\28@070018 by Caisson

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Hello All,

 I've got a device at home with a 8748 Micro-controller on it, from which
I would like to know what it's instruction-set is (An EPROM is sitting
close by).  The controller is used to drive a one-line character-tube of
about 60 char.  It was used in an old electronic Type-writer.

But I can't seem to find any decent documentation about the thing.  I've
found a descriptions of it's pin's , but nothing more.  I've visited the
NEC & INTEL sites, but their search engines came up with nothing, or next
to nothing :-((  Standard Search-engines (AltaVista, Yahoo) came up with
numerous hits, but not with regards to a micro-controller :-)

Someone knows where to find more about the beast ?  Pretty please :-)

Greetz,
 Rudy Wieser

1999\07\28@072739 by Michael Rigby-Jones

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Go to http://www.xs4all.nl/~ganswijk/chipdir/fam/8051/8048.htm

Unfortunately all the pages of the datasheet are stored as gifs, so it's a
bit slooowww.

The 8748 is the eprom version of the 8048.  Both were the predecessors of
the 8051 and the instruction set is very simmilar.  Somewher I even have an
assembler for the 8048, although I scrounged it from somewhere on the net so
it's probably still around.

I found this on Altavista BTW ;o)

Mike Rigby-Jones

> {Original Message removed}

1999\07\28@100039 by Jim Robertson

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At 13:30 27/07/99 +0200, you wrote:

I used this chip in a eprom emulator sold though DIY (AKA kits'r'us) in Hong
kong. These chips were discontinued years ago and thus the lack of data
currently available.

My data source is the intel embedded controller handbook 1988. Other sources
are the cheap TAB microcontroller data books that you may fine collecting
dust somewhere. I seem to have several of these books covering these chips.

Here is a real hint. These parts are very similar to the 4042 keyboard
controller used in the early AT motherboards. You might have more luck
tracking down data on these chips. Also search for the TASM assembler or
other 8048 assembler. The manual may have some info I'm sure.

The thing I remember most about these chips was the short jump was page
orientated, (absolute 8-bit address to the current page, not relative)


Jim




{Quote hidden}

Regards,

Jim Robertson
NEWFOUND ELECTRONICS
________________________________________
Email: spam_OUTnewfoundTakeThisOuTspampipeline.com.au
http://www.new-elect.com
MPLAB compatible PIC programmers.
________________________________________

1999\07\28@182557 by Dennis Plunkett

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At 13:30 27/07/99 +0200, you wrote:
>Hello All,
>
>  I've got a device at home with a 8748 Micro-controller on it, from which
>I would like to know what it's instruction-set is (An EPROM is sitting
>close by).  The controller is used to drive a one-line character-tube of
>about 60 char.  It was used in an old electronic Type-writer.
>
>But I can't seem to find any decent documentation about the thing.  I've
>found a descriptions of it's pin's , but nothing more.  I've visited the
>NEC & INTEL sites, but their search engines came up with nothing, or next
>to nothing :-((  Standard Search-engines (AltaVista, Yahoo) came up with
>numerous hits, but not with regards to a micro-controller :-)
>
>Someone knows where to find more about the beast ?  Pretty please :-)
>
>Greetz,
>  Rudy Wieser
>
>

Hey Rudy where is the [OT]? <G>
Anyway, the 8048 was also made by Philips and has an appearance in the 1992
microcontroller data book (Along with the 8051 stuff)

Dennis

1999\07\28@195014 by - KITS EDUCACIONAIS NACIONAIS

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Caisson wrote:
>
> Hello All,
>
>   I've got a device at home with a 8748 Micro-controller on it, from which
> I would like to know what it's instruction-set is (An EPROM is sitting
> close by).  The controller is used to drive a one-line character-tube of
> about 60 char.  It was used in an old electronic Type-writer.
>
>
> Greetz,
>   Rudy Wieser

I have Some experience with it...some assembly mounter, some samples, some appli
cation notes...
The set of instructions remember the 8051...
It's a 8 bits microcontroller...

May i help you?

Miguel

1999\07\29@005515 by paulb

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Michael Rigby-Jones wrote:

> The 8748 is the eprom version of the 8048.

 ... so if you have an EPROM chip and *also* an external EPROM, you
have quite an interesting situation!  AFAIK, it can't use both internal
and external EPROM (for program, at least).
--
 Cheers,
       Paul B.

1999\07\29@213319 by Dennis Plunkett

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At 10:33 29/07/99 +0200, you wrote:
{Quote hidden}

Yes it is but the 8052 has 4K of EPROM as a base and 256bytes of RAM (Plus
the SFRs, gee I like this beast!)
Dennis

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