Wayne Howell

Clocks on NE64

Discussion created by Wayne Howell on Jun 20, 2007
Latest reply on Jun 21, 2007 by Diego Nunes
Hi,
 
I'm using the MC9S12NE64. Initially been using the Axiom development board.
 
The Axiom board uses a 25MHz crystal with the internall PLL enabled. The PLL boosts to 50MHz so that the /2 internal clock is also 25MHz (or that's my understanding!)
 
The internal clock needs to be 25MHz for the EMAC to operate at 100BaseT.
 
The Axiom documentation states that 'you should not do what they are doing' because the max external bus frequency is 16MHz.
 
Does this actually mean that the NE64 cannot 'officially' be used with 100BaseT and the external bus enabled?
 
Thanks
 
Wayne

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