Hitachi H8/3062 Hardware Manual page 362

Therefore, 0 data can be transferred ahead of 1 data by making compare match B occur before
compare match A. 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 IMFA interrupt service routine write the next data in
NDR. The next data must be written before the next compare match B occurs.
Figure 10.10 shows the timing relationships.
Compare
match A
Compare
match B
NDR
DR
Figure 10.10 Non-Overlapping Operation and NDR Write Timing
NDR write
0 output 0/1 output
Write to NDR
in this interval
Do not write
to NDR in this
interval
NDR write
0 output 0/1 output
Write to NDR
in this interval
Do not write
to NDR in this
interval
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