Sorry for double-post. Bloody Outlook Express. Richard [in PE12]
8051 architecture question
Started by ●May 4, 2005
Reply by ●May 6, 20052005-05-06
Reply by ●May 6, 20052005-05-06
On Wed, 04 May 2005 22:52:40 -0400, the renowned JBrewster <john@fakeemail.com> wrote:>I've been through a couple of 8051 tutorials but still have a very >fuzzy view of its architecture. > >Could someone draw me a simple view of it. > >From what I gather there is Program Memory and Data Memory. > >Withing Data Memory there are > >1) General Purpose Registers (arranged in banks) >2) Bit Addressable Registers >3) Stack Space >4) SFR (Special Function Registers) > > >Now are Program Memory and Data Memory 2 separate memory spaces? If >not exactly where in Program memory does Data memory fit in? I read >something about both these memories being dual mapped... > >Also where does the reserved memory area and scratchpad memory fit >into the picture. > >Thanks.Get Intel's original MSC-51 family user manual. That's got the most complete description I've seen. Most of the subsequent manufacturers omit and/or gloss over most of the basic info and show you the differences and additions. Google for it, and if you can't find it, come back and I'll snicker at you. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by ●May 6, 20052005-05-06
Spehro Pefhany wrote:> On Wed, 04 May 2005 22:52:40 -0400, the renowned JBrewster > <john@fakeemail.com> wrote: > > >>I've been through a couple of 8051 tutorials but still have a very >>fuzzy view of its architecture. >> >>Could someone draw me a simple view of it. >> > >>From what I gather there is Program Memory and Data Memory. > >>Withing Data Memory there are >> >>1) General Purpose Registers (arranged in banks) >>2) Bit Addressable Registers >>3) Stack Space >>4) SFR (Special Function Registers) >> >> >>Now are Program Memory and Data Memory 2 separate memory spaces? If >>not exactly where in Program memory does Data memory fit in? I read >>something about both these memories being dual mapped... >> >>Also where does the reserved memory area and scratchpad memory fit >>into the picture. >> >>Thanks. > > > Get Intel's original MSC-51 family user manual. That's got the most > complete description I've seen. Most of the subsequent manufacturers > omit and/or gloss over most of the basic info and show you the > differences and additions. > > Google for it, and if you can't find it, come back and I'll snicker at > you. > > > Best regards, > Spehro PefhanyYes, I have an old, dog eared Intel book of the 8051. I went to the Intel site, and lo, and behold, their users manual for the 8051 is that exact same manual as I got 15 years ago. It even looks like a scan.
Reply by ●May 6, 20052005-05-06
On Fri, 06 May 2005 15:38:15 -0700, the renowned Scott Moore <samiamsansspam@Sun.COM> wrote:>Spehro Pefhany wrote: >> On Wed, 04 May 2005 22:52:40 -0400, the renowned JBrewster >> <john@fakeemail.com> wrote: >> >> >>>I've been through a couple of 8051 tutorials but still have a very >>>fuzzy view of its architecture. >>> >>>Could someone draw me a simple view of it. >>> >> >>>From what I gather there is Program Memory and Data Memory. >> >>>Withing Data Memory there are >>> >>>1) General Purpose Registers (arranged in banks) >>>2) Bit Addressable Registers >>>3) Stack Space >>>4) SFR (Special Function Registers) >>> >>> >>>Now are Program Memory and Data Memory 2 separate memory spaces? If >>>not exactly where in Program memory does Data memory fit in? I read >>>something about both these memories being dual mapped... >>> >>>Also where does the reserved memory area and scratchpad memory fit >>>into the picture. >>> >>>Thanks. >> >> >> Get Intel's original MSC-51 family user manual. That's got the most >> complete description I've seen. Most of the subsequent manufacturers >> omit and/or gloss over most of the basic info and show you the >> differences and additions. >> >> Google for it, and if you can't find it, come back and I'll snicker at >> you. >> >> >> Best regards, >> Spehro Pefhany > >Yes, I have an old, dog eared Intel book of the 8051. I went to the Intel >site, and lo, and behold, their users manual for the 8051 is that exact >same manual as I got 15 years ago. It even looks like a scan.Yup. It's got hyperlinks, but they are on top of the scan. Mine is dog-eared, but I don't dare touch it much these days as the paper they used was pretty crummy. The MCS-48 section is somewhat depleted.
