LEA: Difference between revisions

Latest revision as of 02:12, 16 July 2024


Basic Info
Addressing Mode	Opcode	Length	ROM Speed	RAM Speed	Cache Speed
Immediate	Fnxxxx	3 bytes	9 cycles	9 cycles	3 cycle


Flags Affected
B	ALT1	ALT2	O/V	S	CY	Z
0	0	0	.	.	.	.

LEA is a Super FX official macro that loads two immediate bytes into a general register. It is an alias for IWT. It stands for "load effective address."^[2]

The ALT0 state is restored.

Syntax

LEA Rn, #xx

Example

After executing LEA R₃, #4853h:

R₃ = 4853h

External Links

Official Nintendo documentation on LEA: 9.47 on Page 2-9-67 of Book II
Table 2-2-2 on page 2-2-8 of Book II, lbid.

@@ Line 1: / Line 1: @@
-{| class="wikitable" style="float:right;clear:right;width:40%"
+{| class="wikitable" style="float:right;clear:right;width:50%"
 !colspan="8"|Basic Info
 |+
+|'''Addressing Mode'''
 |'''Opcode'''
 |'''Length'''
@@ Line 8: / Line 9: @@
 |'''Cache Speed'''
 |+
+|[[Immediate]]
 |Fnxxxx
 |3 bytes
@@ Line 24: / Line 26: @@
 |[[Sign Flag|S]]
 |[[CY]]
-|Z
+|[[Zero Flag|Z]]
 |+
 |0
@@ Line 35: / Line 37: @@
 |}
-'''LEA''' is a [[Super FX]] official macro that loads two immediate bytes.  It is an alias for [[IWT]].  It probably stands for "load effective address."
+'''LEA''' is a [[Super FX]] official macro that loads two immediate bytes into a general register.  It is an alias for [[IWT]].  It stands for "load effective address."<sup>[2]</sup>
+The [[ALT0]] state is restored.
+==== Syntax ====
+<pre>
+LEA Rn, #xx
+</pre>
+==== Example ====
+After executing LEA R<sub>3</sub>, #4853h:
+ R<sub>3</sub> = 4853h
+=== See Also ===
+* [[LDA]]
+* [[IBT]]
 === External Links ===
 * Official Nintendo documentation on LEA: 9.47 on [https://archive.org/details/SNESDevManual/book2/page/n223 Page 2-9-67 of Book II]
+* Table 2-2-2 on page 2-2-8 of Book II, lbid.
 [[Category:ASM]]
 [[Category:Super FX]]
 [[Category:Three-byte Instructions]]