h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 384

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 12 Watchdog Timer (WDT)
12.3.2
When the WDT is used as an interval timer, an interval timer interrupt (WOVI) is generated each
time the TCNT overflows. Therefore, an interrupt can be generated at intervals.
When the TCNT overflows in interval timer mode, an interval timer interrupt (WOVI) is requested
at the time the OVF bit of the TCSR is set to 1.
12.4
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. OVF must be
cleared to 0 in the interrupt handling routine.
If an NMI interrupt request has been selected in watchdog timer mode, an NMI interrupt request is
generated when the TCNT overflows.
Table 12.1 WDT Interrupt Sources
Rev. 2.00 Dec. 05, 2005 Page 346 of 724
REJ09B0200-0200
Name
WOVI
NMI
Interval Timer Mode
Interrupt Sources
Interrupt Source
TCNT overflow (interval timer mode)
TCNT overflow (watchdog timer mode)
Interrupt Flag
OVF
OVF