HD64F3028F25 Datasheet, PDF (394/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Contention between 16TCNT Word Write and Increment: If an increment pulse occurs in the
T₃ state of a 16TCNT word write cycle, writing takes priority and 16TCNT is not incremented.
Figure 9.38 shows the timing in this case.
16TCNT word write cycle
T₁
T₂
T₃
φ
Address bus
16TCNT address
Internal write signal
16TCNT input clock
16TCNT
N
M
16TCNT write data
Figure 9.38 Contention between 16TCNT Word Write and Increment
Rev. 2.00, 09/03, page 362 of 890