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Memory/Accumulator Select: Difference between revisions
From SnesLab
(only relevant in native mode) |
(what REP/SEP might do) |
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It can be affected by: | It can be affected by: | ||
* [[REP]] | * [[REP]] (might clear it) | ||
* [[SEP]] | * [[SEP]] (might set it) | ||
* [[PLP]] | * [[PLP]] | ||
* [[RTI]] | * [[RTI]] | ||
Revision as of 23:46, 21 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:
This flag is only relevant in native mode.
See Also
Reference
- Eyes & Lichty, page 422, Table 18.2. 65x Flags. https://archive.org/details/0893037893ProgrammingThe65816/page/422