Fujitsu MB90390 Series Hardware Manual page 296

CHAPTER 16 8/16-BIT PPG
Assume that PRLL is updated from A to C before (1) in the time chart above, and PRLH is updated from B
to D after (1). Since the PRL values at (1) are PRLL=C and PRLH=B, a pulse of "L" side count value C
and "H" side count value B is output only once.
Similarly, to write data in PRL of ch.0 and ch.1 in 16-bit PPG mode, use a long word transfer instruction,
or use word transfer instructions in the order of ch.0 and then ch.1. In this mode, the data is only
temporarily written to ch.0 PRL. Then, the data is actually written into ch.0 PRL when the ch.1 PRL is
written to.
In a mode other than 16-bit PPG mode, ch.0 and ch.1 PRL are written independently.
ch.0 write in a mode other
than 16-bit PPG mode
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Figure 16.8-2 PRL Write Operation Block Diagram
ch.0 PRL write data
Temporary latch
ch.0 PRL
ch.1 PRL write data
Transferred in synchronization
with ch.1 write in 16-bit
PPG mode
ch.1 write
ch.1 PRL