9.4.2 Computed GOTO
A computed 
GOTO is accomplished by adding an offset to the Program Counter
                (ADDWF PCL). When performing a table read using a computed
                GOTO method, care has to be exercised if the table location crosses
            a PCL memory boundary (each 256-byte block). Refer to the following Microchip
            application note, available at the corporate website (www.microchip.com):- AN556, “Implementing a Table Read”
