HI
S12XE expanded bus has the similar functionality and features to S12XD devices, so you can refer to following ANotes. Useful links regarding S12X ext bus design: http://www.freescale.com/files/microcontrollers/doc/app_note/AN2708.pdf
In An2992 there is an example of interfacing with a device connected to expanded bus.
http://www.freescale.com/files/microcontrollers/doc/app_note/AN2992.pdf
Have a great day,
Jennie Zhang
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