r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 857

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

14.4.2
To use the WDT as an interval timer, set the WT/IT bit to 0 and TME bit in TCSR to 1.
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 same time the OVF bit in the TCSR is set to 1.
WDTOVF signal
Internal reset signal *
Notes: 1. If TCNT overflows when the RSTE bit is set to 1, an internal reset signal is generated.
2. 130 states when the RSTE bit is cleared to 0.
Interval Timer Mode
H'FF
H'00
TCNT count
WT/IT=1
TME=1
1
Figure 14.2 Operation in Watchdog Timer Mode
H'00 written
to TCNT
WDTOVF and
internal reset are
generated
Overflow
132 states *
WOVF=1
518 states
Rev. 1.00 Sep. 19, 2008 Page 829 of 1270
2
Section 14 Watchdog Timer (WDT)
WT/IT=1
TME=1
H'00 written
to TCNT
REJ09B0466-0100
Time