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H/V Counter Latch: Difference between revisions
From SnesLab
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=== References === | === References === | ||
* page 2-11-1 of official Super Nintendo development manual: https://archive.org/details/SNESDevManual/book1/page/n76 | * page 2-11-1 of official Super Nintendo development manual: https://archive.org/details/SNESDevManual/book1/page/n76 | ||
* https://problemkaputt.de/fullsnes.htm#snespputimersandstatus | |||
[[Category:Video]] | |||
Revision as of 22:57, 4 July 2023
The H/V Counter Latch (SLHV, or Software Latch Horizontal/Vertical) is a dummy read-only S-PPU1 register located at 2137h. Its sole purpose is to cause the PPU to latch the current raster beam position into OPHCT and OPVCT when it is read. The value read is open bus.
References
- page 2-11-1 of official Super Nintendo development manual: https://archive.org/details/SNESDevManual/book1/page/n76
- https://problemkaputt.de/fullsnes.htm#snespputimersandstatus