5.4.1 Modifying PCL

Executing any instruction with the PCL register as the destination simultaneously causes the Program Counter PC[14:8] bits (PCH) to be replaced by the contents of the PCLATH register. This allows the entire contents of the Program Counter to be changed by writing the desired upper seven bits to the PCLATH register. When the lower eight bits are written to the PCL register, all 15 bits of the Program Counter will change to the values contained in the PCLATH register and those being written to the PCL register.