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Break Flag: Difference between revisions
From SnesLab
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# https://problemkaputt.de/fullsnes.htm#cpuregistersandflags | # https://problemkaputt.de/fullsnes.htm#cpuregistersandflags | ||
# [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/422 page 422], Table 18.2. 65x Flags. | # [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/422 page 422], Table 18.2. 65x Flags. | ||
# page 486, lbid. | # [https://archive.org/details/0893037893ProgrammingThe65816/page/486 page 486], lbid. | ||
Revision as of 03:07, 9 August 2024
Note: This page may be confusing or inaccurate. See the talk page.
The Break Flag (B) exists on the SPC700, as bit 4 of the Program Status Word. It discerns between IRQs and BRK.
BRK and PHP[dubious] set the break flag. IRQs, NMIs, and reset clear it.[1]
RETI and POP can modify the break flag.
In emulation mode the 65c816 has a break flag too.[2] But in native mode it becomes the Index Register Select. PLP can affect the break flag.[3]
See Also
References
- https://problemkaputt.de/fullsnes.htm#cpuregistersandflags
- Eyes & Lichty, page 422, Table 18.2. 65x Flags.
- page 486, lbid.