Hitachi H8/3035 Series Hardware Manual page 302

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TCNT
Internal write
signal
TCNT input
clock
TCNT
Figure 10-8 Contention between TCNT Write and Increment
Changing CKS2 to CKS0 Values: Halt TCNT by clearing the TME bit to 0 in TCSR before
changing the values of bits CKS2 to CKS0.
288
Write cycle: CPU writes to TCNT
T T
1 2
N
T
3
M
Counter write data