Hi Everyone..
I am a Newbie and just starting to write some programm for my lpc2378. At the moment i am trying to make the PLL Setup Sequence for my LPC2378. unfortunately i can't understand this step from User Manual
.. 4) Write to the clock source selection control register to change the clock souce.
I'd have the Main Oscillator as my Clock Source.
CLKSRCSEL = 0x1; /* select main OSC as the PLL clock source */ PLLFEED = 0xaa; PLLFEED = 0x55;
In User Manual can be read that The main oscillator operates at frequencies of 1 MHz to 24 MHz.
My Question: How can i operate the main oscillator with a constant freq? For example 12 MHz ? I need this constant frequenz, so i can configure my PLL
Anyone can help me??
Thank You
You can download an excel sheet from the website of NXP to help you calculate required PLL values.
@Tamil
Do you have the link for the Excel ? I can't find it!!
Thank you
www.google.be/url
If you try to Google for "lpc23xx pll excel" - don't you get a nice link?
There is no need for any !! - especially if you haven't really made any real attempt at finding it.
The 1MHz .. 24MHz is the allowed range for the external crystal used as base frequency for the PLL.
I'm sorry for not finding the link. I only searched on the NXP sites. Of course i forgot the holy Google :-)
Thank You for your help