BBC (SPC700)

Basic Info
Addressing Mode	Opcode	Length	Speed
Direct Page	13	3 byte	when condition is false: 5 cycles when condition is true: 7 cycles
Direct Page	33	3 byte	when condition is false: 5 cycles when condition is true: 7 cycles
Direct Page	53	3 byte	when condition is false: 5 cycles when condition is true: 7 cycles
Direct Page	73	3 byte	when condition is false: 5 cycles when condition is true: 7 cycles
Direct Page	93	3 byte	when condition is false: 5 cycles when condition is true: 7 cycles
Direct Page	B3	3 byte	when condition is false: 5 cycles when condition is true: 7 cycles
Direct Page	D3	3 byte	when condition is false: 5 cycles when condition is true: 7 cycles
Direct Page	F3	3 byte	when condition is false: 5 cycles when condition is true: 7 cycles

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

BBC (Branch on Bit Clear) is an SPC700 instruction that performs a branch when a bit in the direct page is clear. 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

• BBS

External Links

• Official Super Nintendo development manual on BBC: Appendix C-8 of Book I