D12320VF25IV Datasheet, PDF (626/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 13 Watchdog Timer
13.4 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.
13.5 Usage Notes
13.5.1 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 13.8 shows this operation.
TCNT write cycle
T₁
T₂
φ
Address
Internal write signal
TCNT input clock
TCNT
N
M
Counter write data
Figure 13.8 Contention between TCNT Write and Increment
Rev.6.00 Sep. 27, 2007 Page 594 of 1268
REJ09B0220-0600