GameBoy\Opcode::opcode27 PHP Method

    public static function opcode27(Core $core)
    {
        $temp_var = $core->unswtuw(($core->registerD << 8) + $core->registerE - 1);
        $core->registerD = $temp_var >> 8;
        $core->registerE = $temp_var & 0xff;
    }