debugger skips nop:

frdchang

hello

;=================================
;Programming the SX microcontroller
;TUT001.src
;=================================
;LIST Q = 37
DEVICE  SX28L, TURBO, STACKX, OSCHS2
IRC_CAL IRC_FAST
FREQ  50_000_000
RESET  0

  mov  !rb, #%11111110
Loop
  clrb rb.0
  nop
  nop
  nop
  setb rb.0
  jmp  Loop

when i run the debugger for this blinking led code, it steps the first nop, then skips to the setb instruction.

is this normal?· (it seems like it only executes 1 nop and ignores the other 2)

thanks,
fred

PJMonty

Fred,

The SX chip does not allow you to set breakpoints on NOPs. This means, even though they are being executed, all debuggers will skip right through them during debugging. Here's a page that gives some more info and a workaround:

www.sxlist.com/techref/ubicom/debuggers.htm

Look towards the bottom of the page where it says, "Notes."

Thanks,
PeterM