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Last Post 21 Feb 2006 04:10 PM by kurtl@logicpd.com

MCF5474 AE5 pin

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yanhua347@sohu.com

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Posts:

15 Feb 2006 09:52 PM
I am using the MCF5474lite I found the AE5 pin of MCF5474 is low when the CPU be reset or power on? who can explane the phenomena? thanks

kurtl@logicpd.com

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21 Feb 2006 02:40 PM
wateryear2004, According to Freescale Datasheet, pin AE5 is "Hi-Z" during reset refer to page 69 of this document to confirm: http://www.freescale.com/...manual/MCF5475RM.pdf There is also a pullup on this signal (R372D) so the signal should be high when the product is in reset. Can you describe your situation in more detail?

kurtl@logicpd.com

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21 Feb 2006 04:10 PM
I powered up a kit at my desk and tried to reproduce your problem. I probed the baseboard J21 connector pad C9. When I powered on the kit, it toggled from high to low to high again. When I held the kit in reset using button J11 the MCF_RW# signal stayed high. Please explain your setup in more detail.

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