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PLB: Difference between revisions
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'''PLB''' (PulL data Bank) is a [[65c816]] instruction that pulls the byte at the top of the [[stack]] into the [[data bank register]]. PLB is the only instruction that modifies that register. | '''PLB''' (PulL data Bank) is a [[65c816]] instruction that pulls the byte at the top of the [[stack]] into the [[data bank register]]. PLB is the only instruction that modifies that register.<sup>[1][dubious, see [[MVP]] and [[MVN]]]</sup> The [[stack pointer]] is incremented before the byte it points to is pulled into the register. | ||
==== Syntax ==== | |||
<pre> | |||
PLB | |||
</pre> | |||
PLB works even in [[emulation mode]] even though all bank addresses are forced to zero.<sup>[5]</sup> | |||
=== See Also === | === See Also === | ||
* [[PLA]] | |||
* [[PLD]] | * [[PLD]] | ||
* [[PLX]] | * [[PLX]] | ||
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=== External Links === | === External Links === | ||
# [[Eyes & Lichty]], [https://archive.org/details/0893037893ProgrammingThe65816/page/484 page 484] on PLB | |||
# [[Labiak]], [https://archive.org/details/Programming_the_65816/page/n178 page 168] on PLB | |||
# snes9x implementation of PLB: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2032 | |||
# Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.8.3 | |||
# section 7.8.2 of 65c816 datasheet | |||
[[Category:ASM]] | [[Category:ASM]] | ||
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[[Category:Pull Instructions]] | [[Category:Pull Instructions]] | ||
[[Category:One-byte Instructions]] | [[Category:One-byte Instructions]] | ||
[[Category:Four-cycle Instructions]] | |||
Latest revision as of 19:25, 6 August 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Stack (Pull) | AB | 1 byte | 4 cycles | ||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| N | V | M | X | D | I | Z | C | |
| N | . | . | . | . | . | Z | . | |
PLB (PulL data Bank) is a 65c816 instruction that pulls the byte at the top of the stack into the data bank register. PLB is the only instruction that modifies that register.[1][dubious, see MVP and MVN] The stack pointer is incremented before the byte it points to is pulled into the register.
Syntax
PLB
PLB works even in emulation mode even though all bank addresses are forced to zero.[5]
See Also
External Links
- Eyes & Lichty, page 484 on PLB
- Labiak, page 168 on PLB
- snes9x implementation of PLB: https://github.com/snes9xgit/snes9x/blob/master/cpuops.cpp#L2032
- Clark, Bruce. http://www.6502.org/tutorials/65c816opcodes.html#6.8.3
- section 7.8.2 of 65c816 datasheet