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CPUK
From SnesLab
CPUK is the S-SMP's clock signal, which oscillates at 2.048 MHz with a 50% duty cycle. It is produced by the S-DSP and output on its pin 48, then goes into pin 16 of the S-SMP. It does not connect to anything else.
The official dev manual has a typo that states that the speed is 2.48 MHz. [2]
See Also
External Links
- https://archive.nes.science/nesdev-forums/f12/t10458.xhtml
- Page 3-1-1 of Book I of the official Super Nintendo development manual