GameBoy\Cbopcode::cbopcode53 PHP Method

    private static function cbopcode53(Core $core)
    {
        $core->registersHL = ($core->registersHL & 0xff00) + (($core->registersHL & 0xf) << 4) + (($core->registersHL & 0xf0) >> 4);
        $core->FZero = ($core->registersHL & 0xff) == 0;
        $core->FCarry = $core->FHalfCarry = $core->FSubtract = false;
    }