Fujitsu MB90390 Series Hardware Manual page 281

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Reload register L/H selector
This selector detects the current pin output level to select which register value, Low reload register
(PRLL0) or High reload register (PRLH0), should be reloaded to the PPG0 down counter.
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Count clock selector
This selector selects the count clock to be input to the PPG0 down counter from five frequency-divided
clocks of the machine clock or the frequency-divided clocks of the time-base timer.
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PPG output control circuit
This circuit inverts the pin output level and the output when an underflow occurs.
CHAPTER 16 8/16-BIT PPG
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