Content originally posted in LPCWare by woodchuck on Mon Aug 02 13:08:17 MST 2010 What clock rates do the 1114, 1343, and 1768 operate at, by default, in the LPCxpresso environment? Which initialization file specifies this value?
Content originally posted in LPCWare by CodeRedSupport on Tue Aug 03 01:33:39 MST 2010 From memory, 48MHz (LPC11), 72MHz (LPC13) and 100MHz (LPC17) are the default settings used. These are set up in the [FONT=Courier New][SIZE=2]system_LPC[I]nn[/I]xx.c[/SIZE][/FONT] file (replace [FONT=Courier New][SIZE=2][I]nn[/I][/SIZE][/FONT] with part number) within the appropriate CMSIS library project.
If you access the[FONT=Courier New][SIZE=2] SystemCoreClock[/SIZE][/FONT] variable within your code base, then you can see what clock speed has been set up. [Note that if you don't actually reference SystemCoreClock from your code, the linker will normally remove it from the final image - so you won't then be able to see it within the debugger.]
If you want to change clock speeds, then I would advise using the PLL spreadsheet NXP have available:
