Bank Address Register: Difference between revisions

Latest revision as of 23:36, 6 July 2024

Note: this page is likely inaccurate/confusing;

The Bank Address Register (also known as the bank byte) is Nintendo's name for the 8-bit register that fills in the most significant bits of a 24-bit address memory access by the 5A22. It keeps track of what bank the CPU is configured to use. It is cleared to zero on reset.

PLB, MVN, and MVP modify this register.

References

Figure 2-21-2 on page 2-21-3 of Book I of the official Super Nintendo development manual
section 2.5 on page 6 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf

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 ''Note: this page is likely inaccurate/confusing;''
-The '''Bank Address Register''' (also known as the '''bank byte''') is Nintendo's name for the 8-bit register that fills in the most significant bits of a 24-bit address memory access by the [[5A22]].  It keeps track of what bank the CPU is configured to use.
+The '''Bank Address Register''' (also known as the '''bank byte''') is Nintendo's name for the 8-bit register that fills in the most significant bits of a 24-bit address memory access by the [[5A22]].  It keeps track of what bank the CPU is configured to use.  It is cleared to zero on reset.
-[[PLB]] is the only instruction that modifies this register.
+[[PLB]], [[MVN]], and [[MVP]] modify this register.
 === See Also ===
@@ Line 11: / Line 11: @@
 === References ===
 * Figure 2-21-2 on [https://archive.org/details/SNESDevManual/book1/page/n94 page 2-21-3 of Book I] of the official Super Nintendo development manual
-* page 6 of 65c816 datasheet
+* section 2.5 on page 6 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf
 [[Category:Registers]]
 [[Category:ASM]]