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SX28 Datasheet Quick Read Through


Found the answer to why the instruction set I read threw me off the one time.
A superset of these instructions are available in the SASM
assembler of the SX-Key IDE, and supported by the SX
Key User’s Manual. Both are available for free download
from www.parallax.com/sx.

This 'Native' instruction set is more to my liking.

43 instructions. Very PIC like.

Manual is like a breath of fresh air compared to Microchip datasheet.

This SX datasheet was either written BY Parallax or with their co-operation.

Will post link to it.



Assembler Novice

All round good guy

Comments

  • 6 Comments sorted by Date Added Votes

  • Here's the link.

    https://www.parallax.com/downloads/sx20ac-and-sx28ac-datasheet

    This is a FINE piece of writing.It is done by Parallax.

    Yet it within the constraints of working with a set piece of hardware.

    It is copyrighted 2008.This is most excellent!

    Assembler Novice

    All round good guy

  • Here's another little 'nugget of gold' in here.The internal oscillator.
    The internal RC mode uses an internal oscillator, so the
    device does not need any external components. At
    4 MHz, the internal oscillator provides typically +/-8%
    accuracy over the allowed temperature range. The internal
    clock frequency can be divided down to provide one of
    eight lower-frequency choices by selecting the desired
    value in the FUSE Word register. The frequency range is
    from 31.25 KHz to 4 MHz. The default operating
    frequency of the internal RC oscillator may not be 4
    MHz. This is due to the fact that the SX device requires
    trimming to obtain 4 MHz operation. The parts shipped
    out of the factory are not trimmed. The device relies on
    the programming tool provided by the third party vendors
    to support trimming.
    Figure 9-

    What that means to us is you can run it at 31.25 khz.That is k hertz not mega.

    That means you can write simple 32 count delay loops.Instead of loop upon loop to slow down a fast chip.

    Another tidbit is it says 'Fuse' about some of the registers.That is early terminology of micro's.

    Replaced by 'configuration'.


    Assembler Novice

    All round good guy
  • Do you talk to yourself at the bus stop, too?
    I am the Master, and technology my slave.

  • May I resume here?

    Looking at the Configuration section of manual.

    There is no Config line like with PIC's.

    You do the configuration with the programmer.SX Blitz or SX Key.

    A little strange but I can live with it.

    Assembler Novice

    All round good guy
  • microcontrolleruser,

    PIC programmers not only write to the program into program memory, but also write to data to the EEPROM and burn in the Configuration Bits.

  • Thanks Genetix

    Yes.Different.That's for sure.

    The SX Key also runs at 20mhz while it programs.That's kind of odd.

    Then when it is debugging it does the same.

    Guess it was a tradeoff to get the debugger built into the programmer at the time.

    Assembler Novice

    All round good guy
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