BBS (SPC700)

Basic Info
Addressing Mode	Opcode	Length	Speed
Direct Page	03	3 bytes	when condition false: 5 cycles when condition true: 7 cycles
Direct Page	23	3 bytes	when condition false: 5 cycles when condition true: 7 cycles
Direct Page	43	3 bytes	when condition false: 5 cycles when condition true: 7 cycles
Direct Page	63	3 bytes	when condition false: 5 cycles when condition true: 7 cycles
Direct Page	83	3 bytes	when condition false: 5 cycles when condition true: 7 cycles
Direct Page	A3	3 bytes	when condition false: 5 cycles when condition true: 7 cycles
Direct Page	C3	3 bytes	when condition false: 5 cycles when condition true: 7 cycles
Direct Page	E3	3 bytes	when condition false: 5 cycles when condition true: 7 cycles

Flags Clobbered
N	V	P	B	H	I	Z	C
.	.	.	.	.	.	.	.

BBS (Branch on Bit Set) is an SPC700 instruction that performs a branch when a bit in the direct page is set. The direct page byte that bit lives in is the first operand. The bit within that byte is a function of the high nibble of the opcode. The target relative address to jump to is the second operand.

See Also

• BBC

References

• Appendix C-8 of Book I of the official Super Nintendo development manual