Content originally posted in LPCWare by starblue on Thu Apr 23 04:54:10 MST 2015
The system tick timer is an part of the core, and in the case of the LPC541xx both cores have it (its optional on the M0, and for example the M0 on LPC43xx doesn't have it).
So in your case it is no problem to use it both on the M0 and the M4, as these are two separate timers.