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B Flag (Super FX): Difference between revisions
From SnesLab
(Specified which opcodes the B-flag affects.) |
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The '''B | The '''B Flag''' is on the [[Super FX]], and is set when [[WITH]] runs. It is bit 4 of SFR. | ||
These instructions change their behaviour on the B flag: | These instructions change their behaviour on the B flag: | ||
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* [[ALT1]] | * [[ALT1]] | ||
* [[ALT2]] | * [[ALT2]] | ||
* [[ALT0]] | |||
=== | === References === | ||
* [https://archive.org/details/SNESDevManual/book2/page/n158 page 2-9-2 of Book II] of the official Super Nintendo development manual | * [https://archive.org/details/SNESDevManual/book2/page/n158 page 2-9-2 of Book II] of the official Super Nintendo development manual | ||
* [https://archive.org/details/SNESDevManual/book2/page/n110 page 2-4-4 of Book II], lbid. | |||
[[Category:Flags]] | [[Category:Flags]] | ||
[[Category:Super FX]] | [[Category:Super FX]] | ||
[[Category:ASM]] | [[Category:ASM]] | ||
Latest revision as of 23:06, 21 July 2024
The B Flag is on the Super FX, and is set when WITH runs. It is bit 4 of SFR.
These instructions change their behaviour on the B flag:
For both of them, the Rn is set by the preceeeding WITH Rn.
Many instructions clear the B flag, including:
- ADC Rn
- ADC #n
- ADD Rn
- ADD #n
- AND Rn
- AND #n
- ASR
- BIC Rn
- BIC #n
- CACHE
- CMODE
- CMP Rn
- COLOR
- DEC Rn
- DIV2
- FMULT
- GETB
- GETBH
- GETBL
- GETBS
- GETC
- HIB
- IBT Rn, #pp
- INC Rn
- IWT Rn, #xx
- JMP Rn
- LDB (Rm)
- LDW (Rm)
- LEA Rn, xx
- LINK #n
- LJMP Rn
- LM Rn, (xx)
- LMS Rn, (yy)
- LMULT
- LOB
- LOOP
- LSR
- MERGE
- MOVE Rn, Rn'
- MOVES Rn, Rn'
- MULT Rn
- MULT #n
- NOP
- NOT
- OR Rn
- OR #n
- PLOT
- RAMB
- ROL
- ROMB
- ROR
- RPIX
- SBC Rn
- SBK
- SEX
- SM (xx), Rn
- SMS (yy), Rn
- STB (Rm)
- STOP
- STW (Rm)
- SUB Rn
- SUB #n
- SWAP
- UMULT Rn
- and presumably UMULT #n too
See Also
References
- page 2-9-2 of Book II of the official Super Nintendo development manual
- page 2-4-4 of Book II, lbid.