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

Bean is right, you shouldn't count on them being global.  Since the NOPRESERVE option is used instead of NOCODE there is a BANK 0 instruction inserted at the head of the ISR so this works fine for the program as it is.  

Yes, you can move the tix timer to the serial bank, but there are implications: you can't declare a word in the array so you have to declare two bytes; tix_LSB and tix_MSB.  Then update the top of the ISR like this:

[code]Check_Timer:
  ASM
    BANK serial
    CJA  tix_MSB, #0, Check_Timer_Done
    CJA  tix_LSB, #0, Check_Timer_Done

Update_Timer:
    SUB  tix_LSB, #1
    SUBB tix_MSB, /C

Check_Timer_Done:
    BANK 0
  ENDASM[/code]

This replaces the SX/B code that was there (it's actually a small modification of the compiler output).  Then you have to adjust the DELAY_MS subroutine:

[code]' Use: WAIT_MS mSecs

WAIT_MS:
  IF __PARAMCNT = 1 THEN
    tmpW1 = __PARAM1                            ' get byte parameter
  ELSE
    tmpW1 = __WPARAM12                          ' get word parameter
  ENDIF

  DO WHILE tmpW1 > 0
    tix_MSB = 0
    tix_LSB = 230
    
MS_Hold:
    IF tix_LSB > 0 THEN MS_Hold                 ' is tix zero?
    IF tix_MSB > 0 THEN MS_Hold
    DEC tmpW1                                   ' yes 
  LOOP 
  RETURN[/code]

This routine could be optimized so that you're only using a byte; the word was used so that you could create custom delays based on ISR ticks elsewhere in the program.

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