How to make working one HCTL2016 and a PIC16F876

[mister_e]

mmm, can you tell more about what you want to do with the rotary encoder???

i'd never use this IC and i believe we can remove it and connect the encoder directly to the PIC.

I often use rotary encoder in my apps to navigate between menu and/or get user entry. So an extra IC should be motivated by something that i don't see/understand.

Bellow is one example to use rotary encode to increment/decrement a variable

    ' Procedure to get value change from rotary encoder
    '
    OldPos = (PORTB & %11000000)>>6 ' get only PORTB<7:6> bits
    NewPos = OldPos 
    
    ' see if encoder has move
    ' 
    while ((NewPos==0) or (NewPos==3)) 
       NewPos = (PORTB & %11000000)>>6 ' get only PORTB<7:6> bits
       wend
    
    pause 20 ' debounce delay
 
    ' Get encoder movement
    ' --------------------
    '
    '      Rotary encoder output table (clockWise rotation):
    '      -------------------------------------------------
    '             00
    '             01 between move (half detent)
    '             11
    '             10 between move (half detent)
    '
    '     Using XOR
    '
    '               OldPOS   : 0     0     3     3
    '               NewPos   : 1     2     1     2
    '               movement : CW   CCW   CCW    CW
    '           XOR -------------------------------
    '                          1     2     2     1
    '
    ' So, if NewPos XOR OldPos = 1 => increment
    '        Newpos XOR OldPos = 2 => Decrement    
    '
    Newpos=newpos ^ oldpos 
    select case newpos

           case 1
               menuchoice=menuchoice+1

           case 2
               menuchoice=menuchoice-1

     end select