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Can anybody please help to resolve my problem.

I am using RCM2200 module. I am trying to use memory mapped I/O for my display. I’ve connected data bus D0-D7 to 74HC574 and its output is connectd to display data lines.

Address lines A0-A3 are connected to A0-A2 of the 74HC373 latch. Y0 is connected to CP of the 74HC574. CE is connected to PE7 of the rabbit.

I’ve used WrPortE(0xE000, NULL, datafordisplay); this function is not working.
Could any body please sugest some guidelines to resolve this issue.