D12320VF25V Datasheet, PDF (462/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 11 Watchdog Timer
11.4 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.
11.5 Usage Notes
11.5.1 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 11.8 shows this operation.
TCNT write cycle
T₁
T₂
φ
Address
Internal write signal
TCNT input clock
TCNT
N
M
Counter write data
Figure 11.8 Contention between TCNT Write and Increment
Rev.7.00 Feb. 14, 2007 page 428 of 1108
REJ09B0089-0700