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LEA: Difference between revisions
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''' | {| class="wikitable" style="float:right;clear:right;width:50%" | ||
!colspan="8"|Basic Info | |||
|+ | |||
|'''Addressing Mode''' | |||
|'''Opcode''' | |||
|'''Length''' | |||
|'''ROM Speed''' | |||
|'''RAM Speed''' | |||
|'''Cache Speed''' | |||
|+ | |||
|[[Immediate]] | |||
|Fnxxxx | |||
|3 bytes | |||
|9 cycles | |||
|9 cycles | |||
|3 cycle | |||
|} | |||
{| 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 | ||
|+ | |+ | ||
|B | |[[B Flag|B]] | ||
|ALT1 | |[[ALT1]] | ||
|ALT2 | |[[ALT2]] | ||
|O/V | |[[O/V]] | ||
|S | |[[Sign Flag|S]] | ||
|CY | |[[CY]] | ||
|Z | |[[Zero Flag|Z]] | ||
|+ | |+ | ||
|0 | |0 | ||
| Line 20: | Line 36: | ||
|. | |. | ||
|} | |} | ||
'''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 === | === External Links === | ||
* Official Nintendo documentation on LEA: https://archive.org/details/SNESDevManual/book2/page/n223 | * 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:ASM]] | ||
[[Category:Super FX]] | [[Category:Super FX]] | ||
[[Category:Three-byte Instructions]] | |||
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
See Also
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.