PLB: Difference between revisions

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]

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

@@ Line 1: / Line 1: @@
-'''PLB''' (PulL data Bank) is a [[65c816]] instruction that pulls the 8-bit value at the top of the [[stack]] into the [[data bank register]].
+{| class="wikitable" style="float:right;clear:right;width:40%"
-{| class="wikitable" style="float:right;clear:right;width:30%"
 !colspan="8"|Basic Info
 |+
@@ Line 9: / Line 7: @@
 |'''Speed'''
 |+
-|stack
+|[[Stack Addressing|Stack]] (Pull)
 |AB
 |1 byte
@@ Line 16: / Line 14: @@
 {| class="wikitable" style="float:right;clear:right;width:30%"
-!colspan="9"|Flags Clobbered
+!colspan="9"|Flags Affected
+|+
+|[[Negative Flag|N]]
+|[[Overflow Flag|V]]
+|[[M Flag|M]]
+|[[X Flag|X]]
+|[[Decimal Flag|D]]
+|[[I Flag|I]]
+|[[Zero Flag|Z]]
+|[[Carry Flag|C]]
 |+
 |N
-|V
-|M
-|X
-|D
-|I
-|Z
-|C
-|+
-|
 |.
 |.
@@ Line 33: / Line 31: @@
 |.
 |.
-|
+|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.<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 ===
+* [[PLA]]
+* [[PLD]]
+* [[PLX]]
+* [[PLY]]
+* [[PHB]]
 === External Links ===
-* [[Eyes & Lichty]] page on PLB: https://archive.org/details/0893037893ProgrammingThe65816/page/n510
+# [[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:65c816 additions]]
+[[Category:Pull Instructions]]
+[[Category:One-byte Instructions]]
+[[Category:Four-cycle Instructions]]