We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS

DBNZ (SPC700)

From SnesLab
Revision as of 10:30, 14 December 2023 by Xetheria (talk | contribs) (→‎References: Table C-15)
Jump to: navigation, search
Basic Info
Addressing Mode Opcode Length Speed
Direct Page / Program Counter Relative 6E 3 bytes when condition is false: 5 cycles

when condition is true: 7 cycles

Implied (type 1) / Program Counter Relative FE 2 bytes when condition is false: 4 cycles

when condition is true: 6 cycles

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

DBNZ is an SPC700 instruction that decrements a direct page location or the Y index register and then jumps if that value is nonzero. The direct page index is the first operand and also the first byte immediately following the opcode. The relative branch offset is the second operand, the second byte following the opcode.[2]

See Also

References

  1. Official Super Nintendo development manual on DBNZ: Table C-15, Appendix C-8 of Book I
  2. anomie's SPC700 doc