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Pixel Clock
From SnesLab
The Pixel Clock signal is generated by the PPU by dividing the Master Clock frequency by 4. On NTSC, the pixel clock is 5.37 MHz. On PAL, 5.32 MHz. [1]
The PPU usually emits one dot every 4 CPU clock cycles, but some long dots take more cycles. [2]
References
- https://problemkaputt.de/fullsnes.htm#snestimingoscillators
- ares/sfc/ppu/counter/inline.hpp:61