H8S-2643 Datasheet, PDF (575/1277 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer

Section 11 16-Bit Timer Pulse Unit (TPU)
(4) Contention between TCNT Write and Increment Operations
If incrementing occurs in the T₂ state of a TCNT write cycle, the TCNT write takes precedence
and TCNT is not incremented.
Figure 11.50 shows the timing in this case.
TCNT write cycle
T₁
T₂
φ
Address
TCNT address
Write signal
TCNT input
clock
TCNT
N
M
TCNT write data
Figure 11.50 Contention between TCNT Write and Increment Operations
Rev. 3.00 Jan 11, 2005 page 521 of 1220
REJ09B0186-0300O