Move cursor to specific node

Hello,

I would like to know if there is any possibility to mode cursor to some specific node.

For example: Let say cursor is at the end of some line and you press enter and you would like to jump to previous position (end of line).

I tried:

var selection = getEditorInstance().window.$.getSelection();
var newRange = getEditorInstance().document.$.createRange();
var e=getEditorInstance().getSelection().getRanges(),
    f=e[0];
var oldNode = f.getPreviousNode();
if (oldNode != null)
{
  newRange.setStart(oldNode, 0);
  selection.removeAllRanges();
  selection.addRange(newRange);
}

But it doesn't work. So I'm asking, if this is even possible and if yes - how?