We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
Memory/Accumulator Select: Difference between revisions
From SnesLab
(high byte is called B) |
(only relevant in native mode) |
||
| Line 10: | Line 10: | ||
* [[PLP]] | * [[PLP]] | ||
* [[RTI]] | * [[RTI]] | ||
This flag is only relevant in [[native mode]]. | |||
=== See Also === | === See Also === | ||
Revision as of 23:42, 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