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Absolute Boolean Bit: Difference between revisions
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''' | '''Absolute Boolean Bit''' is used on the [[SPC700]] by some instructions to address individual bits: | ||
* [[AND1]] | * [[AND1]] | ||
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* [[NOT1]] | * [[NOT1]] | ||
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 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. | ||
=== See Also === | === See Also === | ||
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=== Reference === | === Reference === | ||
* [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. | |||
[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Addressing Modes]] | [[Category:Addressing Modes]] | ||
[[Category: | [[Category:Official Jargon]] | ||
Latest revision as of 07:40, 18 December 2023
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.
See Also
Reference
- page 3-8-8 of Book I of the official Super Nintendo development manual
- Figure 3-8-3 on page 3-8-9, lbid.