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

You need to use the resolution parameter of RCTIME.
I see you are using "2" now, just increase it to "8" and the value returned will be 1/4. So if using "2" would have returned 1000, then using "8" would return 250 and you can just test if irPulse > 250

irPulse VAR BYTE

DO 
  rctime rc.0, 1, irPulse, 8 
LOOP UNTIL irPulse > 250

rctime rc.0, 1, irPulse, 4
IF irPulse > 150 THEN
  ' whatever
ENDIF 
IF irPulse > 250 THEN
  ' whatever
ENDIF

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