HD6417606 RENESAS [Renesas Technology Corp], HD6417606 Datasheet - Page 238

• Manufacturer Part Number: HD6417606
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 9 Watchdog Timer (WDT)
9.3.4
When operating in interval timer mode, interval timer interrupts are generated at every overflow of
the counter. This enables interrupts to be generated at set periods.
1. Clear the WT/IT bit in WTCSR to 0, set the type of count clock in the CKS2 to CKS0 bits, and
2. Set the TME bit in WTCSR to 1 to start the count in interval timer mode.
3. When the WTCNT overflows, the WDT sets the IOVF flag in WTCSR to 1 and an interval
9.4
Note the following when using the WDT.
1. When using the WDT in interval mode, no overflow occurs by the H'00 immediately after
This does not occur when the WDT is used in watchdog timer mode.
Rev. 4.00 Sep. 13, 2007 Page 212 of 502
REJ09B0239-0400
set the initial value of the counter in WTCNT.
timer interrupt request is sent to the INTC. The WTCNT then resumes counting.
writing H'FF to WDTCNT. (IOVF in WTCSR is not set.) The overflow occurs at a point when
the count reaches H'00 after one cycle.
Using Interval Timer Mode
Usage Note