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BMI (SPC700): Difference between revisions

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'''BMI''' is an [[SPC700]] instruction that performs a branch when the negative flag is set.
{| class="wikitable" style="float:right;clear:right;width:50%"
 
{| class="wikitable" style="float:right;clear:right;width:40%"
!colspan="8"|Basic Info
!colspan="8"|Basic Info
|+
|+
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|'''Speed'''
|'''Speed'''
|+
|+
|relative
|[[Program Counter Relative]]
|30
|30
|2 bytes
|2 bytes
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{| class="wikitable" style="float:right;clear:right;width:30%"
{| class="wikitable" style="float:right;clear:right;width:30%"
!colspan="8"|Flags Clobbered
!colspan="8"|Flags Affected
|+
|+
|N
|[[Negative Flag|N]]
|V
|[[Overflow Flag|V]]
|P
|[[Direct Page Flag|P]]
|B
|[[Break Flag|B]]
|H
|[[Half-Carry Flag|H]]
|I
|[[Interrupt Enable Flag|I]]
|Z
|[[Zero Flag|Z]]
|C
|[[Carry Flag|C]]
|+
|+
|.
|.
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|.
|.
|}
|}
'''BMI''' is an [[SPC700]] instruction that performs a branch when the [[negative flag]] is set.
No flags are affected.
==== Syntax ====
<pre>
BMI rel
</pre>
Where rel is a two's complement offset.


=== See Also ===
=== See Also ===
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=== External Links ===
=== External Links ===
* Official Super Nintendo development manual on BMI: [https://archive.org/details/SNESDevManual/book1/page/n234 Appendix C-8 of Book I]
* Official Super Nintendo development manual on BMI: Table C-15, [https://archive.org/details/SNESDevManual/book1/page/n233 Appendix C-8 of Book I]
* anomie: https://github.com/yupferris/TasmShiz/blob/master/spc700.txt#L361


[[Category:ASM]]
[[Category:ASM]]
[[Category:SPC700]]
[[Category:SPC700]]
[[Category:Branching Commands]]
[[Category:Branching Commands]]

Latest revision as of 21:58, 4 August 2024

Basic Info
Addressing Mode Opcode Length Speed
Program Counter Relative 30 2 bytes when condition is false: 2 cycles

when condition is true: 4 cycles

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

BMI is an SPC700 instruction that performs a branch when the negative flag is set.

No flags are affected.

Syntax

BMI rel

Where rel is a two's complement offset.

See Also

External Links