Hitachi H8/3032 Series Hardware Manual page 271

Contention between TCNT Byte Write and Increment: If an increment pulse occurs in the T
or T
TCNT byte that was not written retains its previous value. See figure 8-63, which shows an
increment pulse occurring in the T
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state of a TCNT byte write cycle, writing takes priority and TCNT is not incremented. The
3
2
ø
Address
Internal write signal
TCNT input clock
TCNTH
TCNTL
Figure 8-63 Contention between TCNT Byte Write and Increment
state of a byte write to TCNTH.
TCNTH byte write cycle
T T T
1 2
TCNTH address
N
TCNTH write data
X X + 1
256
2
3
M
X