List posts by category

I have several posts and some of them have a category called "Highlight" and the others are uncategorized, what I need to do is list all these posts, the first ones always need to be the "Highlight" category regardless of when were posted.

The code I have is simply listing all the posts, I have already tried to use the command oderby only without success, I may have done wrong too.

My code is as follows:

    <?php $posts = get_posts( array('post_type'=>'sala', 'numberposts'=>-1, 'order'=>'ASC') ); ?>
    <?php setup_postdata($post);?>

         <?php foreach($posts as $post):

                   /* mostro salas */

         <?php endforeach;?>

I do not have much experience with Wordpress.