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Break Flag

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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]

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

  1. https://problemkaputt.de/fullsnes.htm#cpuregistersandflags
  2. Eyes & Lichty, page 422, Table 18.2. 65x Flags. https://archive.org/details/0893037893ProgrammingThe65816/page/422
  3. page 486, lbid.
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