delay routines for arm

hello,
i am using keil compiler for lpc21398 programming were can i find delay routines for this controller or whart is the formula for calculating delay routined for all lpc series controllers

lpc21398 ??

is it lpc2138?
also mention the crystall u r using.
also google for lpc_2000 book from hitech.
also get the lpc213x.4x user manual from nxp's site

i am using lpc2138 with 12 MHz crystal,but i have to write every time delay routines whenever the crystal is changed.any solution for delay routines for all crystals

for all crystalls?
no i dont think there is any solution to that.