HD6413007F20 Datasheet, PDF (370/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

9. 16-Bit Timer
Contention between 16TCNT Byte Write and Increment: If an increment pulse occurs in the T₂
or T₃ state of a 16TCNT byte write cycle, writing takes priority and 16TCNT is not incremented.
The 16TCNT byte that was not written retains its previous value. See figure 9.39, which shows an
increment pulse occurring in the T₂ state of a byte write to 16TCNTH.
16TCNTH byte write cycle
T₁
T₂
T₃
φ
Address bus
16TCNTH address
Internal write signal
16TCNT input clock
16TCNTH
16TCNTL
N
M
16TCNT write data
X
X+1
X
Figure 9.39 Contention between 16TCNT Byte Write and Increment
Rev.5.00 Sep. 12, 2007 Page 340 of 764
REJ09B0396-0500