Hi,
Please check the below application notes (pages 14-17 for AN3907 and pages 9-10 for AN4345) and let me know if this helps.
http://cache.freescale.com/files/32bit/doc/app_note/AN3907.pdf
http://cache.freescale.com/files/microcontrollers/doc/app_note/AN4345.pdf
Regards
Soledad
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