Haihang Sun

MCF52259 USB Module Clock

Discussion created by Haihang Sun on Jul 20, 2009
Latest reply on Jul 23, 2009 by Rich Testardi

Hi

 

If I want to use USB module (as HOST ) in 52259, the USB clock MUST be 48MHz, right? I saw this in the reference manual, but could not find the reason.

 

If I disable PLL, in order to generate all the component clocks I need (UART, USB, Ethnet etc), could I use external 16MHz oscillator, or I must use 48Mhz oscillator.

 

 

Basically, my question/problem is:

In my coldfire 52259 board, it has 16Mhz oscillator. If I want to disable PLL, could I generate all component clocks I need?  

 

Regards,

 

 

 

 

 

 

Message Edited by eGuy on 2009-07-20 11:40 AM

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