HD6432633 Datasheet, PDF (742/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

15.4 Interrupts
During interval timer mode operation, an overflow generates an interval timer interrupt (WOVI).
The interval timer interrupt is requested whenever the OVF flag is set to 1 in TCSR. OVF must be
cleared to 0 in the interrupt handling routine.
If an NMI request has been chosen in the watchdog timer mode, an NMI request is generated
when a TCNT overflow occurs.
15.5 Usage Notes
15.5.1 Contention between Timer Counter (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 timer counter is not incremented. Figure 15-8 shows this operation.
TCNT write cycle
T₁
T₂
ø
Address
Internal write signal
TCNT input clock
TCNT
N
M
Counter write data
Figure 15-8 Contention between TCNT Write and Increment
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