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Searching for data sheets MC1468705 series ...

Discussion in 'Hobby Electronics' started by budgie, Sep 4, 2004.

  1. budgie

    budgie Guest

    I'm hunting for a data sheet for preferably the 1468705G2S variant but others
    would be interesting. Google searches reveal nothing, and most listings in the
    Moto AN series lead to dead-ends at onsemi, mot-sps or freescale websites.

    Any helpful suggestions would be appreciated.
  2. onestone

    onestone Guest

    This sounds like a very early 6805 microcontroller. You might try
    searching MC68705, this returned 299 hits on google. If this is what you
    want then there are many variants of the part.

  3. budgie

    budgie Guest

    Thanks Al that is the series it belongs to, but I specifically need info such as
    the EPROM capacity/programming etc which would be more specific than the generic
    6805 for which I do have a data sheet.
  4. Alan

    Alan Guest


    I have some limited info.

    The 1467805G2 has 2106 Bytes of Eprom. 128 bytes of "page 0" eprom
    starting at 80 hex then 1968 bytes of "user" eprom.

    Also 112 bytes RAM, top 64 bytes of which are the stack.

    I have the schematic of a programmer for that device. You put the
    progamme first into a 2764 and then plug the 68705 and the 2764 into
    the programme and the internal programming algorithm in the 68705
    programmes itself. Takes approx 200 seconds to programme.

    If you want a copy of the programmer cct (2 IC sockets, 2 leds, 3
    switches, a few transistors and resistors/caps and a 1.0MHz xtal) then
    use my contact page to send me your mailing address and I will copy
    and send in the post for you.



    Jenal Communications
    Manufacturers and Suppliers of HF Selcall
    P O Box 1108, Morley, WA, 6943
    Tel: +61 8 9370 5533 Fax +61 8 9467 6146
    Web Site:
  5. budgie

    budgie Guest

    Ah, the old 'bootloader" ....
    Will do, and thanks.
  6. Alan Peake

    Alan Peake Guest

    If you can get the old Motorola data books, it's in the MCU one
    (Microcomputer Data Book) circa 1983.
    I thought I had one but that must have been the one missing from my set.
  7. bruce varley

    bruce varley Guest

    Hi Peter, I have the MCU data book. Email me if you'd like to borrow.

    remove ecks and kyoo to email.
  8. Hello Bruce Varley,
    I was looking for information on the "Varley Test" on
    an old megger that I picked up recently. Since you
    have the same name, you might have zeroed in on
    this particular test and know all about it.
    A long shot, I know, but I had to ask. :)

    All I could find out is that a man called Varley was
    an engineer on board the cable laying ship Great
    Eastern way back in 18?? and he had devised a
    way of locating breaks in the transatlantic telegraph
    cable. You might even be related. That would be
    something! Carrying on the family electronics tradition.

    John Crighton
  9. budgie

    budgie Guest

    Hi Bruce

    Alan H kindly forwarded a copy of pp 125-137 from some book. It has answered
    lot of questions and raised a few. If that corresponds to the section 6 in your
    book then it's the same. I was planning on checking out the "library" at WWE
    next week. Things like cold/warm start vectors, interrupt routine vector etc
    etc I still need to tie down. Will get back to you if required, tnx.
  10. Alan

    Alan Guest


    Have a look at the memory map on page 137. The reset vector is
    $1FFE - $1FFF. All the interrupt vectors are at the top as well.

    Normally use an .org of $80 or $100 depending on what you want.

    Let me know if I can give you any more info (although what I have is



    Jenal Communications
    Manufacturers and Suppliers of HF Selcall
    P O Box 1108, Morley, WA, 6943
    Tel: +61 8 9370 5533 Fax +61 8 9467 6146
    Web Site:
  11. budgie

    budgie Guest

    Ahh - should have read the fine print :-(
    Should be cool now tnx
  12. bruce varley

    bruce varley Guest

    Same name, and there are a few engineers in our family, but according to the
    work done by one of my rellies in UK, there's no explicit connection with Mr
    Varley of loop fame. All I know about his test is that it's a bridge method
    that can locate cable faults of some sort. Regards
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