Direct Page Bit Relative Addressing

Direct Page Bit Relative Addressing is an addressing mode supported by the SPC700, used by these instructions:

• BBS
• BBC

Both of which are three bytes long:

• The first byte is the opcode, as usual. The opcode's top 3 bits address which bit to test within a particular direct page byte.
• The middle byte is which direct page location the bit to test lives in.
• The last byte is the target relative address to conditionally jump to.

Syntax

BBS dp, bit, rel
BBC dp, bit, rel

See Also

• Direct Page Bit Addressing

Reference

• Figure 3-8-3 Memory Access Addressing Effective Address on page 3-8-9 of Book I of the official Super Nintendo development manual