PMDC SERVO MOTOR WITH quadrature encoder DRIVE ?

[phoenix_1]

OK now next step are steped.
I write calculation to increment in CW my variable defined as LONG to be incremented from position buffer
which go from 0-12500 and again and again..

' Pic 18F4431 @ 20MHz true XTAL
    define osc 20
    DEFINE HSER_RCSTA 90h            
    DEFINE HSER_TXSTA 24h            
    DEFINE HSER_SPBRG 64              
    DEFINE HSER_CLROERR 1             
    ADCON0=0                          
    ANSEL0=0                          

    PortA = 0
    PortB = 0
    PortC = 0

    TRISA = %011100                 
    TRISB = %00000000
    TRISC = %10000000                 

    QEICON=%10011000
    DFLTCON = %00111000              
    MAXCNTL = %11010100             
    MAXCNTH = %00110000                
    PosLow VAR BYTE                    
    PosHigh VAR BYTE                   
    PosTemp VAR BYTE                   
    Position VAR WORD                     
    y var LONG
    x var BYTE
    x = 0 
    y = 0
    POSCNTL = 0                     
    POSCNTH = 0                       
    PIR3.2 = 0  
    CLEAR
        
    Start:
    Gosub GetPosition
    y =  (x * 12500) + position 
    HSEROUT [dec y]
    Pause 10                      
    Goto Start                       


GetPosition:
    PosHigh = POSCNTH                     
    PosLow = POSCNTL                       
    PosTemp = POSCNTL                         
    If PosLow - PosTemp = 0 then Goto Done  
    PosHigh = POSCNTH                     
    PosLow = POSCNTL  
Done: 
    Position = POSHIGH * 256 + PosLow    
    if PIR3.2 = 1 then x = x+ 1
    PIR3.2 = 0
    RETURN 
    END

Now I can count a long trip of mechanic of machine which is present in LONG variable in CW direction.
But I have new problem in my head all these days and it is next.
I have BIT which indicate direction of motor and it is in QEICON.5.
If QEICON.5 is 0 then we go CCW and if it is 1 then we go CW direction.
Now if we go CW and stop motor it wil be 1 all the time to next move
and if we go CCW it will be 0 and after we stop from CCW it will be 0 all time to next move..
Confuse how to make matematic to implement new formula for decrement LONG variable in CCW :
y = y - (12500-position) or similar becous in CCW position go from 12500-0 and again 12500-0....
If any idea or someone want to help THANKS.
Regards Robert