GameBoy\Cbopcode::cbopcode13 PHP Method

    private static function cbopcode13(Core $core)
    {
        $core->FCarry = ($core->registersHL & 0x1) == 0x1;
        $core->registersHL = ($core->registersHL & 0xff00) + ($core->FCarry ? 0x80 : 0) + (($core->registersHL & 0xff) >> 1);
        $core->FHalfCarry = $core->FSubtract = false;
        $core->FZero = ($core->registersHL & 0xff) == 0x0;
    }