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APU Oscillator
From SnesLab
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The APU oscillator (X2) is in region 3C of the jwdonal schematic
The APU oscillator (X2) is clocked at 24.6 MHz, slightly faster than the master clock.
- Side 1 is XTALO, connected to pin 45 of the S-DSP and C72.
- Side 2 is XTALI, connected to pin 46 of the S-DSP and C71.
It is not connected to anything else. XTAL stands for "crystal," but according to a board photo[3] X2 is actually a ceramic oscillator. It does not clock the S-SMP directly.
See Also
References
- http://problemkaputt.de/fullsnes.htm#snestimingoscillators
- Figure 2-22-1 on page 2-22-2 of the official Super Nintendo development manual
- Sanglard, Fabien. The Hearts of the Super Nintendo. https://fabiensanglard.net/snes_hearts