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The smallest addressable memory cell on the F28xx is 16-bits.This is mentioned in the TMS320C28x C/C++ Language Implementation User's Guide (SPRU514) in Section 6.3 called Data Types.
There are compiler instrinsics __byte() and __mov_byte() to access data in increments of 8-bits.
This info from the TMS320C28x Optimizing C/C++ Compiler User's guide (SPRU514) may help (page 82):
By ANSI/ISO C definition, the sizeof operator yields the number of bytes required to store an object. ANSI/ISO further stipulates that when sizeof is applied to char, the result is 1. Since the TMS320C28x char is 16 bits (to make it separately addressable), a byte is also 16 bits. This yields results you may not expect; for example, size of (int) = = 1 (not 2). TMS320C28x bytes and words are equivalent (16 bits).
To access data in increments of 8 bits, use the __byte() and __mov_byte() intrinsics described in Section 7.4.4.
