B Flag (Super FX)

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:

• TO R_n' as MOVE R_n,R_n'
• FROM R_n' as MOVES R_n,R_n'

For both of them, the R_n is set by the preceeeding WITH R_n.

Many instructions clear the B flag, including:

• ADC R_n
• ADC #n
• ADD R_n
• ADD #n
• AND R_n
• AND #n
• ASR
• BIC R_n
• BIC #n
• CACHE
• CMODE
• CMP R_n
• COLOR
• DEC R_n
• DIV2
• FMULT
• GETB
• GETBH
• GETBL
• GETBS
• GETC
• HIB
• IBT R_n, #pp
• INC R_n
• IWT R_n, #xx
• JMP R_n
• LDB (R_m)
• LDW (R_m)
• LEA R_n, xx
• LINK #n
• LJMP R_n
• LM R_n, (xx)
• LMS R_n, (yy)
• LMULT
• LOB
• LOOP
• LSR
• MERGE
• MOVE R_n, R_n'
• MOVES R_n, R_n'
• MULT R_n
• MULT #n
• NOP
• NOT
• OR R_n
• OR #n
• PLOT
• RAMB
• ROL
• ROMB
• ROR
• RPIX
• SBC R_n
• SBK
• SEX
• SM (xx), R_n
• SMS (yy), R_n
• STB (R_m)
• STOP
• STW (R_m)
• SUB R_n
• SUB #n
• SWAP
• UMULT R_n
• and presumably UMULT #n too

See Also

• Dither Flag
• Break Flag
• ALT1
• ALT2
• ALT0

References

• page 2-9-2 of Book II of the official Super Nintendo development manual
• page 2-4-4 of Book II, lbid.