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

Your ISR which uses lots of division is probably pushing the sub/func declarations past address $100 -- the declarations must be in the "lower half" of a memory page; i.e. $000-$0FF. The easiest way to ensure this is to move your ISR to the end of your program with a jump -- this way the code that follows, the sub/func declarations will be in the right spot... i.e.

[code]
INTERRUPT 100_000
GOTO Interrupt _Handler ' jump to where the ISR really is

PROGRAM Start
MEASURE_LO    FUNC    2
MEASURE_HI    FUNC    2
delay    SUB    1, 2

Start:
  TRIS_disp = %00000000
  rpm = 1

Main:
  ' lots more code

Subroutine_And_Functions:

Interrupt_Handler:
  LOW RA.3
  digit1 = currentrpm / 100
  currentrpm = __REMAINDER
  READ SegMap + currentrpm, display
  HIGH RA.3
  LOW RA.2
  digit1 = digit1 / 10
  currentrpm = __REMAINDER
  READ SegMap + currentrpm, display
  HIGH RA.2
  LOW RA.1
  digit1 = digit1 / 10
  currentrpm = __REMAINDER
  READ SegMap + currentrpm, display
  HIGH RA.1
  RETURNINT
[/code]

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