h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 459

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

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
Overflow signal
(internal signal)
OVF
TCNT
WT/IT=0
TME=1
Timing of Setting Overflow Flag (OVF)
Overflow
WOVI
Figure 12.5 Interval Timer Operation
Figure 12.6 Timing of Setting of OVF
H'FF
Overflow
WOVI
Rev. 5.00 Sep 22, 2005 page 433 of 1136
Overflow
WOVI
Section 12 Watchdog Timer
H'00
Overflow
REJ09B0257-0500
WOVI
Time