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Direct Page Bit Relative Addressing

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

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

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
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