Hi Richard,

I don't see where you're going with your comments, maybe I'm just thick.

In any case the Int Handler does recognize CW and CCW correctly with every turn and RE_val does increment or decrement accordingly by 1 count per detent as needed - the only issue is these unwanted regular serial disturbances following RE action, including the push button. Speed of rotation isn't a factor with their appearance.

Something else is going on also - if I insert a Clear statement as below the RE_val resets to 0 - as if the PIC is reinitializing following the RE action hence the "I'm Alive" serial traffic. Without the Clear the count remains as it was prior to the serial disturbance.

Is there a chance you could breadboard a 16F1788 and confirm my findings?

Thanks,
Bill

Code:
'   IOCBP = %01110000        ; REa portb.6, REb portb.5  pos edge trigger
   IOCBN = %01110000        ; REa portb.6, REb portb.5, REsw portb.4  neg edge trigger - falling edge only.
   IOCBF = 0                ; Reset the PortB flag.
   INTCON = %11001000       ; GIE, PEIE, IOCIE.
   
clear                        ' Clear all vars.
 
  MaxLimit = 60             ' Menu value limit.  
'  pause 100                 ' Let everything settle...

serout2 PORTC.6,16468,[13,10,"I'm Alive",13,10,10]

SAMPLE of terminal
RE_val 00001
RE_val 00002
RE_val 00003
ButtPush = 1, RE 00003
RE_val 00004
RE_val 00005
RE_val 00006
RE_val 00005
RE_val 00000
RE_val 00000
ButtPush = 1, RE 00000
RE_val 00001
RE_val 00002
RE_val 00003
RE_val 00004
RE_val 00005
RE_val 00006
RE_val 00007
RE_val 00008
RE_val 00009
RE_val 00010
RE_val 00011
RE_val 00010
RE_val 00009
RE_val 00008
RE_val 00007
RE_val 00006
RE_val 00005
ButtPush = 1, RE 00005
RE_val 00006
RE_val 00007
RE_val 00008
I'm Alive


RE_val 00001
RE_val 00002
RE_val 00003
RE_val 00004