HD643303x Hitachi, HD643303x Datasheet - Page 309
HD643303x
Manufacturer Part Number
HD643303x
Description
Hitachi Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD643303X.pdf
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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, or by having the IMFA interrupt activate the DMAC. The next data must be written before
the next compare match B occurs.
Figure 9-10 shows the timing relationships.
Compare
match A
Compare
match B
NDR
DR
Figure 9-10 Non-Overlapping Operation and NDR Write Timing
Do not write
to NDR in this
interval
0 output
0/1 output
Write to NDR
in this interval
NDR write
294
0 output
Do not write
to NDR in this
interval
Write to NDR
in this interval
NDR write
0/1 output
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