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

There are several things that I would change.

1st
  Use "RESET Start" and put a Start label where you want your program to start at

2nd use this to set rd.0 to an output

mov w,#$1F
mov m,w
mov !rd,#%11111110

3rd 
  Because of your code as soon as you turn the LED on you go right back and turn it off, I see no point to the code.  
  If you want the LED pin to go low when the IRPin goes low then just do this:
  
Main:
  MOVB LEDon,IRPin
  JMP Main

There is no reason why the number of NOPs would make it not run. It's not the SX52's fault. There is something funky in the setup.
I would try removing the IR receiver and just connect the pin with a wire to Gnd or Vcc.

Keep trying different things...

Bean.

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