We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS

Break Flag

From SnesLab
Revision as of 22:21, 21 August 2024 by Xetheria (talk | contribs) (→‎References: fragment num)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Note: This page may be confusing or inaccurate. See the talk page.

The Break Flag (B) is bit 4 of the S-SMP's 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

  1. https://problemkaputt.de/fullsnes.htm#cpuregistersandflags
  2. Eyes & Lichty, page 422, Table 18.2. 65x Flags.
  3. page 486, lbid.
  4. Fragment 18.1 on page 436 on BRK, lbid.
Retrieved from "https://sneslab.net/mw/index.php?title=Break_Flag&oldid=20514"