HD6413007F20 Datasheet, PDF (441/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

11. Programmable Timing Pattern Controller (TPC)
11.4.2 Note on Non-Overlapping Output
During non-overlapping operation, the transfer of NDR bit values to DR bits takes place as
follows.
1. NDR bits are always transferred to DR bits at compare match A.
2. At compare match B, NDR bits are transferred only if their value is 0. Bits are not transferred
if their value is 1.
Figure 11.9 illustrates the non-overlapping TPC output operation.
DDR
Q
NDER
Q
Compare match A
Compare match B
C
Q DR D
Q NDR D
TPC output pin
Figure 11.9 Non-Overlapping TPC Output
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 11.10 shows the timing relationships.
Rev.5.00 Sep. 12, 2007 Page 411 of 764
REJ09B0396-0500