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Memory/Accumulator Select: Difference between revisions
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(high byte is called B) |
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* When clear, the accumulator is 16 bits wide. | * When clear, the accumulator is 16 bits wide. | ||
* When set, the accumulator is 8 bits wide, but the high byte is still retained. | * When set, the accumulator is 8 bits wide, but the high byte (B) is still retained. | ||
It can be affected by: | It can be affected by: | ||
Revision as of 03:02, 15 July 2024
The Memory/Accumulator Select (M) flag exists in the processor status register (bit 5) of the 65c816. It indicates whether the accumulator is 8 or 16 bits wide:
- When clear, the accumulator is 16 bits wide.
- When set, the accumulator is 8 bits wide, but the high byte (B) is still retained.
It can be affected by:
See Also
Reference
- Eyes & Lichty, page 422, Table 18.2. 65x Flags. https://archive.org/details/0893037893ProgrammingThe65816/page/422