ON 20030203@2:30:48 PM at page:
http://www.piclist.com/techref/scenix/ip2k.htm
JMN-EFP-786 James Newton published post 37654.3423032407

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This thing runs at 120 and 160 MIPS today.
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ON 20030215@7:56:36 PM at page:
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JMN-EFP-786 James Newton Says
http://www.sxlist.com/techref/scenix/begin.htm
Getting Started

ON 20030215@7:57:36 PM at page:
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JMN-EFP-786 James Newton Code:

<PRE>
Loops: The instructions like JNZ and JZ are the key here.  Basically you
need to load the W register with a value and then decrement it.  You
then execute the JNZ or JZ instruction to determine if you need to keep
looping or if it's time to stop.  Here's a more concrete example:

    mov w, #4        &lt;- We're going to loop 4 times

Top_Of_Loop    &lt;- This is a label

    ; Here is where you would put the
    ; instructions that do the actual work
    ; inside the loop.

    dec w                &lt;- Decrement the loop counter by 1
    jnz Top_Of_Loop    &lt;- IF W not equal to  0, THEN GOTO Top_Of_Loop

This is a fairly useless example, but it demonstrates the basic concept.
Just like in any language, you need to have a place to keep track of how
many times you have gone through the loop.  In this example I use the W
register.  You could just as easily use any other register.  After
loading it with the number of times to want to loop, then you enter the
loop.  It is critical that the place where you initialize the counter is
&lt;outside&gt; the loop itself, or else you'll just keep resetting the
counter forever.  Inside the loop, you'll have some instructions that do
some work.  At the end of the work, you decrement the counter  and then
see if it equals zero yet.  When the &quot;dec&quot; instruction is executed, it
will automatically set the &quot;zero&quot; flag in the CPU if register equals
zero after the &quot;dec&quot;.  That's why we use the JNZ (Jump if Not Zero)
instruction here - if the zero flag is not set, then we jump back to the
label following the &quot;jnz&quot; instruction.

</PRE>

ON 20030215@7:58:29 PM at page:
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ON 20030215@8:00:19 PM at page:
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JMN-EFP-786 James Newton Says

If/Then: As you can see in the above example, the JNZ instruction is
basically an if/then in a single instruction.  That's why I wrote out
the description the way I did.  The instruction itself is just (J)ump if
(N)ot (Z)ero, but that's really just an incredibly compact way of saying
"If the zero flag is not set, then perform the jump".
<P>
Probably the place where you'll get the most confused at first is the
bank scheme for variables that is imposed on you by the SX chip
architecture itself.  that's where a high level language like BASIC or C
helps by hiding the architecture from you and doing a lot of work behind
the scenes.  It's also the reason that high level languages are never as
efficient as programming assembly.  Of course, most people find they are
more efficient <I>programmers</I> when using high level languages, so you
need to consider the tradeoff of execution speed versus time to create
and debug the program itself.
<P>
If you want to use high level languages with the SX, you have numerous
choices, but they pretty much all cost money.  Programming in assembly
is "free" on the SX once you have something like the SX-Key.
Programming in a high level language means paying for a compiler as
well.  Still, you might want to check out some of the available languages.

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ON 20030215@11:06:54 PM at page:
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JMN-EFP-786 James Newton Says
http://www.sxlist.com/techref/scenix/contest/triple.htm
3 way winner contest

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ON 20030219@12:53:37 PM at page:
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JMN-EFP-786 James Newton Says
/techref/scenix/reg/file.htm
SX Embedded Controller File Registers

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