Why are the results returned by REGREAD and REGWRITE incorrect when accessing accumulator registers?

The results returned by REGREAD and REGWRITE are incorrect when accessing accumulator registers.

Answer 1

[MathWorks Support Team]

These functions check for endianness when reading from and writing to accumulator registers. Depending on the endianness, they flip the data bytes. Endianness applies to memory but not to registers, even if the register is memory-mapped. Therefore, the result will always be wrong if a big-endian processor is being used.

In C5500, the accumulators affected are: AC0 or A, AC1 or B, AC2, AC3

In C5400, the accumulators affected are: A, B

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