h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 491

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

12.3.2
To use the WDT as an interval timer, clear the WT/
An interval timer interrupt (WOVI) is generated each time TCNT overflows, provided that the
WDT is operating as an interval timer, as shown in figure 12-5. This function can be used to
generate interrupt requests at regular intervals.
12.3.3
The OVF flag is set to 1 if TCNT overflows during interval timer operation. At the same time, an
interval timer interrupt (WOVI) is requested. This timing is shown in figure 12-6.
With WDT1, the OVF bit of the TCSR is set to 1 and a simultaneous NMI interrupt is requested
when the TCNT overflows if the NMI request has been chosen in the watchdog timer mode.
Legend:
WOVI: Interval timer interrupt request generation
H'FF
H'00
TCNT value
WT/IT = 0
TME = 1
Interval Timer Operation
Timing of Setting Overflow Flag (OVF)
Overflow
WOVI
Figure 12-5 Interval Timer Operation
Overflow
WOVI
I T
bit in TCSR to 0 and set the TME bit to 1.
Rev. 6.00 Feb 22, 2005 page 431 of 1484
Overflow
WOVI
Section 12 Watchdog Timer
Overflow
REJ09B0103-0600
WOVI
Time