We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
Absolute Boolean Bit Addressing: Difference between revisions
From SnesLab
(added syntax) |
(→Reference: added figure name) |
||
| Line 24: | Line 24: | ||
* [[Absolute Addressing]] | * [[Absolute Addressing]] | ||
=== | === References === | ||
* [https://archive.org/details/SNESDevManual/book1/page/n186 page 3-8-8 of Book I] of the official Super Nintendo development manual | * [https://archive.org/details/SNESDevManual/book1/page/n186 page 3-8-8 of Book I] of the official Super Nintendo development manual | ||
* Figure 3-8-3 on [https://archive.org/details/SNESDevManual/book1/page/n187 page 3-8-9], lbid. | * Figure 3-8-3 Memory Access Addressing Effective Address on [https://archive.org/details/SNESDevManual/book1/page/n187 page 3-8-9], lbid. | ||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Addressing Modes]] | [[Category:Addressing Modes]] | ||
[[Category:Official Jargon]] | [[Category:Official Jargon]] | ||
Revision as of 19:56, 12 July 2024
Absolute Boolean Bit is used on the SPC700 by some instructions to address individual bits:
The bottom 13 bits of a 16-bit value specify an absolute address, while the top 3 bits specify which bit within the byte stored at that address. The greatest address these instructions can affect is 1FFFh.
Syntax
AND1 C, mem. bit AND1 C, /mem. bit OR1 C, mem. bit OR1 C, /mem. bit EOR1 C, mem. bit MOV1 C, mem. bit MOV1 mem. bit, C NOT1 mem. bit
See Also
References
- page 3-8-8 of Book I of the official Super Nintendo development manual
- Figure 3-8-3 Memory Access Addressing Effective Address on page 3-8-9, lbid.