r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 557

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

13.4.3
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 counter overflows, the WDT sets the IOVF flag in WTCSR to 1 and an interval
set the initial value of the counter in the WTCNT counter.
timer interrupt request is sent to the INTC. The counter then resumes counting.
WDTOVF signal
Internal reset signal
(power-on reset selected)
Internal reset signal
(manual reset selected)
Using Interval Timer Mode
(When WTCNT Count Clock is Specified to Pφ/32 by CKS2 to CKS0)
WTCNT value
H'FF
H'00
Figure 13.3 Operation in Watchdog Timer Mode
WT/IT = 1
TME = 1
H'00 is written
to WTCNT
WDTOVF is asserted and
an internal reset is generated
Overflow occurs
3 Pφ + one cycle of count clock
WOVF = 1
Rev. 1.00 Sep. 21, 2007 Page 531 of 1124
32 Pφ clock
18 Pφ clock
Section 13 Watchdog Timer (WDT)
Count starts
H'00 is written
to WTCNT
REJ09B0402-0100
Time