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Bank Address Register: Difference between revisions
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''Note: this page is likely inaccurate/confusing;'' | ''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]] is the only instruction that modifies this register. | ||
Revision as of 23:25, 28 June 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 is the only instruction that modifies this register.
See Also
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