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Simulate Data Bus Width of 16-bit for External Memory

Is it possible to simulate external memory with a DBW of 16-bit? My external memory is setup so that 2 chips with 8-bit memory are sharing the same memory location. I would like to be able to simulate this with the uVision debugger. I enabled the memory region for the debugger with the statement

MAP  0x10000000,0x1000FFFF  READ WRITE  // allow R/W access to external

However, a float still takes up 4 address locations rather than the desired 2.

Any ideas?

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