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BRL: Difference between revisions
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''' | {| class="wikitable" style="float:right;clear:right;width:40%" | ||
!colspan="8"|Basic Info | |||
|+ | |||
|'''Addressing Mode''' | |||
|'''Opcode''' | |||
|'''Length''' | |||
|'''Speed''' | |||
|+ | |||
|[[Program Counter Relative Long]] | |||
|82 | |||
|3 bytes | |||
|4 cycles | |||
|} | |||
{| class="wikitable" style="float:right;clear:right;width:30%" | {| class="wikitable" style="float:right;clear:right;width:30%" | ||
!colspan="9"|Flags | !colspan="9"|Flags Affected | ||
|+ | |+ | ||
|N | |[[Negative Flag|N]] | ||
|V | |[[Overflow Flag|V]] | ||
|M | |[[M Flag|M]] | ||
|X | |[[X Flag|X]] | ||
|D | |[[Decimal Flag|D]] | ||
|I | |[[I Flag|I]] | ||
|Z | |[[Zero Flag|Z]] | ||
|C | |[[Carry Flag|C]] | ||
|+ | |+ | ||
|. | |. | ||
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|. | |. | ||
|} | |} | ||
'''BRL''' (Branch Long) is a [[65c816]] instruction that performs an unconditional jump. The target can be anywhere within the current [[bank]]. | |||
The 16 bit operand is not an absolute address, but a signed displacement from -32768 to 32767. | |||
BRL is relocatable. No flags are affected. | |||
==== Syntax ==== | |||
<pre> | |||
BRL label | |||
</pre> | |||
BRL works even in [[emulation mode]]. | |||
=== See Also === | |||
* [[BRA]] | |||
* [[JMP]] | |||
=== External Links === | |||
* [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/438 page 438] on BRL | |||
* [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n137 page 127] on BRL | |||
* snes9x implementation of BRL: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1405 | |||
* Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.2.1.2 | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:65c816 additions]] | |||
[[Category:Three-byte Instructions]] | |||
[[Category:Four-cycle Instructions]] | |||
[[Category:Relocatable Instructions]] | |||
[[Category:Single Admode Mnemonics]] | |||
Latest revision as of 11:57, 6 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Program Counter Relative Long | 82 | 3 bytes | 4 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| . | . | . | . | . | . | . | . | |
BRL (Branch Long) is a 65c816 instruction that performs an unconditional jump. The target can be anywhere within the current bank.
The 16 bit operand is not an absolute address, but a signed displacement from -32768 to 32767.
BRL is relocatable. No flags are affected.
Syntax
BRL label
BRL works even in emulation mode.
See Also
External Links
- Eyes & Lichty, page 438 on BRL
- Labiak, page 127 on BRL
- snes9x implementation of BRL: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L1405
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.2.1.2