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

Hi,

The attached program simply increments a 32bit timer in the interrupt.
I noticed that in SxSim 2.08.05 that on a snz instruction with Z=0
that rtcc increments by 3. Datasheet says a skip takes 2 cycles.


[code]
device  SX48,OSCHS2
freq  25000000
reset  _reset 

  org $30
dvpTimer1 ds 1
dvpTimer2 ds 1
dvpTimer3 ds 1
dvpTimer4 ds 1 

;first isr run should take 4([url=jmp@)+3(call)+10(sub)+1(mov]jmp@)+3(call)+10(sub)+1(mov[/url] w)+3(retiw) = 21 cycles
       ;first run
  ORG $000
  jmp @dvpTMR_vector  ; 4  4 

_reset
  mov fsr,#dvpTimer1
  clr ind
  mov w,#$88
  mov !option,w
  mov w,#$F8
  mov rtcc,w
  jmp $ 

dvpTMR_vector
  call dvpTMR_S0  ; 3   3
  mov w,#(-217)&255  ; 1   1
  retiw    ; 3   3 

dvpTMR_S0
  inc dvpTimer1  ; 1       1
  snz    ; 1/2     2 (NZ)
  inc dvpTimer2  ; 1
  snz    ; 1/2     2
  inc dvpTimer3  ; 1
  snz    ; 1/2     2
  inc dvpTimer4  ; 1
  retp    ; 3       3
 
[/code]
SxSim bug?

regards peter

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