HD6432633 Datasheet, PDF (703/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

13.6.2 Contention between TCNT Write and Increment
If a timer counter clock pulse is generated during the T2 state of a TCNT write cycle, the write
takes priority and the counter is not incremented.
Figure 13-11 shows this operation.
TCNT write cycle by CPU
T1
T2
ø
Address
TCNT address
Internal write signal
TCNT input clock
TCNT
N
M
Counter write data
Figure 13-11 Contention between TCNT Write and Increment
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