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H/V Counter Latch: Difference between revisions
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The '''H/V Counter Latch''' (SLHV, or Software Latch Horizontal/Vertical) is a dummy read-only [[ | 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. | 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]]. | The value read is [[open bus]]. | ||
=== See Also === | |||
* [[H/V Count Timer]] | |||
=== 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 Book I] of the official Super Nintendo development manual | ||
* 2.3 The Super NES Horizontal/Vertical Counter on [https://archive.org/details/SNESDevManual/book2/page/n334 page 4-2-4 of Book II], lbid | |||
* https://problemkaputt.de/fullsnes.htm#snespputimersandstatus | |||
[[Category:Video]] | |||
[[Category:Timing]] | |||
[[Category:Registers]] | |||
Latest revision as of 04:50, 18 August 2024
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.
See Also
References
- page 2-11-1 of Book I of the official Super Nintendo development manual
- 2.3 The Super NES Horizontal/Vertical Counter on page 4-2-4 of Book II, lbid
- https://problemkaputt.de/fullsnes.htm#snespputimersandstatus