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Re: Early 8051 variants with dual dptr (AMD?)

From Philipp Klaus Krause <pkk@spth.de>
Newsgroups comp.arch.embedded
Subject Re: Early 8051 variants with dual dptr (AMD?)
Date 2016-06-30 09:37 +0200
Organization solani.org
Message-ID <nl2i6c$8m9$1@solani.org> (permalink)
References <nkvuhd$7tf$1@solani.org> <nl03qh$s7i$1@solani.org> <n029nb5r45t3n80p6hjahjdkhivh4k8itf@4ax.com> <td39nbhn82svvq4c2k3r77rkq27hp1mm5k@4ax.com> <nl26d6$3if$2@dont-email.me>

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On 30.06.2016 06:15, rickman wrote:
> 
> I've had many people say they use the 8051 because it is second sourced
> widely.  With multiple DPTR registers, wouldn't the instruction set be
> modified making it no longer code compatible?  Or is the DPTR register
> switched out by some mechanism that is essentially transparent to
> existing code?
> 

There a re lots of different ways to switch the dptr, but they are all
transparent to code that uses only one dptr.

Philipp

P.S.: A wiki page for the multi-dptr stuff is currently being created at
http://sdcc.sourceforge.net/mediawiki/index.php/8051_variants

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Thread

Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-06-29 09:49 +0200
  Re: Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-06-29 11:19 +0200
    Re: Early 8051 variants with dual dptr (AMD?) Martin Riddle <martin_ridd@verizon.net> - 2016-06-29 22:52 -0400
      Re: Early 8051 variants with dual dptr (AMD?) Martin Riddle <martin_ridd@verizon.net> - 2016-06-29 23:28 -0400
        Re: Early 8051 variants with dual dptr (AMD?) rickman <gnuarm@gmail.com> - 2016-06-30 00:15 -0400
          Re: Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-06-30 09:37 +0200
          Re: Early 8051 variants with dual dptr (AMD?) Martin Riddle <martin_ridd@verizon.net> - 2016-06-30 08:26 -0400
          Re: Early 8051 variants with dual dptr (AMD?) Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2016-06-30 22:52 +0200
            Re: Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-07-01 08:06 +0200
        Re: Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-07-07 01:19 +0200
      Re: Early 8051 variants with dual dptr (AMD?) Philipp Klaus Krause <pkk@spth.de> - 2016-06-30 09:28 +0200

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