Hitachi H8S/2338 Series Hardware Manual page 359

Therefore, 0 data can be transferred ahead of 1 data by making compare match B occur before
compare match A. The NDR contents should not be altered during the interval from compare
match B to compare match A (the non-overlap margin).
This can be accomplished by having the TGIA interrupt handling routine write the next data in
NDR, or by having the TGIA interrupt activate the DTC or DMAC. Note, however, that the next
data must be written before the next compare match B occurs.
Figure 8-11 shows the timing of this operation.
Compare match A
Compare match B
NDR
PODR
Figure 8-11 Non-Overlapping Operation and NDR Write Timing
Write to NDR
0 output 0/1 output
Write to NDR
here
Do not write
to NDR here
Write to NDR
0 output 0/1 output
Write to NDR
here
Do not write
to NDR here
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