S3 (1~3) CPU clock select
CPU core frequency = External CPU clock (60~100 MHz) * CPU frequency ratio (2~5.5X). The following table shows the available CPU external clock configurations.
CAUTION: Improper settings may damage the CPU!
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| 1 | 1 | 1 | 60 | MHz | 30 | MHz |
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| 0 | 1 | 1 | 66.8 | MHz | 33.4 | MHz |
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| 1 | 1 | 0 | 75 | MHz | 30 | MHz |
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| 0 | 1 | 0 | 83.3 | MHz | 33.3 | MHz |
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| 1 | 0 | 0 | 90 | MHz | 30 | MHz |
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* | 0 | 0 | 0 | 100 | MHz | 33.3 | MHz |
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| 1 : ON | 0 : OFF | * default | ||
Chapter 2 Installation 23
