Hi. All "enhanced mid-range" has 16 levels. And you want probably these in any new design anyway. Doesn't help keeping track, but give more headroom... :-) Jan-Erik. David C Brown wrote 2014-01-08 14:48: > The return stack on the mid range PICs is limited to 8 levels. Whilst th= is > is generally adequate it is difficult to keep track of the call depth. = Is > there any tool for examining a program for maximum call depth? > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .