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

Currently my ISR is the generic one from the help files for a clock/timer. The only modification so far is what Bean wrote to change tix from 200 to 125 and returnint from 156 to 250.
I want to add code to my ISR a la the examples for updating my display (going to add one of Bean's HC4LEDs to the system).  What method should I use, if any, to re-calc my RTCC return value and tix counter? Do I even need to worry about it? I don't need [i]great[/i] accuracy, but still would like to know. 

I read in Guenther's book all of the stuff about counting the clocks for the ISR, is this also the method for SX/B? Go and look at the generated code and find out what my cycle count is for the ISR?

Is it that as long as I'm under some value (something in the book about nc-7, dont have it with me, and can't remember)

 I am good to go?

 



[code]

ISR_Start:
  
 
  INC tix    
                                 ' update tix counter
  IF tix = 125 THEN                             ' check for 1 second
    tix = 0
    INC secs
        if use_extra = 1 then
            inc extra_secs
         endif
    IF secs = 60 THEN                           ' check for new minute
      secs = 0
      INC mins
 if extra_secs = 60 then
  inc time1
  extra_secs = 0
 endif
      IF mins = 60 THEN                         ' check for new hour
        mins = 0
        INC hrs
        IF hrs = MaxHr THEN
          hrs = 0
        ENDIF
      ENDIF
    ENDIF
  ENDIF
  


 
ISR_Exit:
  RETURNINT 250              
[/code]

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