In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

Jim,

You can't use __WPARAM34 as the result of a division because those bytes (__PARAM3 and __PARAM4) are actually used to hold the divisor during the division -- you code is clobbering you divisor as it runs.  I've been "looking under the hood" a lot and finding areas where internal variables can be used -- here are some examples; you'll see that for TX_DEC5 you do in fact need three user words.

[code]
SUB TX_BYTE
  SEROUT TX, Baud, __PARAM1
  ENDSUB

' -------------------------------------------------------------------------

SUB TX_STR
  strAddr       VAR     __WPARAM34
  sChar         VAR     __PARAM1

  strAddr = __WPARAM12

  DO
    READINC strAddr, sChar
    IF sChar = 0 THEN EXIT
    TX_BYTE sChar
  LOOP
  ENDSUB

' -------------------------------------------------------------------------

SUB TX_DEC5
  wDividend     VAR     tmpW1
  wDivisor      VAR     tmpW2
  wResult       VAR     tmpW3
  wIdx          VAR     tmpB1
  wChar         VAR     wResult_LSB

  \ SB __PARAMCNT.1
  \ CLRB __WPARAM12_MSB
  wDividend = __WPARAM12
  wDivisor = 10_000

  FOR wIdx = 4 TO 0 STEP -1
    wResult = wDividend / wDivisor
    wDividend = __WREMAINDER
    wChar = wChar + "0"
    TX_BYTE wChar
    wDivisor = wDivisor / 10
  NEXT
  ENDSUB[/code]
As you can see there are no opportunities to use internal variables with TX_DEC5; __PARAM1 - __PARAM4 are used by / and __PARAM5 is used for __PARAMCNT.  Sometimes it just works that way.

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