p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 348

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 14 Watchdog Timer (WDT)
14.4.2
When the WDT is used as an interval timer, an interval timer interrupt (WOVI) is generated each
time the TCNT overflows, as shown in figure 14.3. 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 flag of TCSR is set to 1. The timing is shown figure 14.4.
Rev. 1.00 Sep. 21, 2006 Page 310 of 658
REJ09B0310-0100
WOVI : Interval timer interrupt request occurrence
H'FF
H'00
Interval Timer Mode
TCNT value
φ
TCNT
Overflow signal
(internal signal)
OVF
WT/IT = 0
TME = 1
Figure 14.3 Interval Timer Mode Operation
Overflow
WOVI
Figure 14.4 OVF Flag Set Timing
H'FF
Overflow
WOVI
Overflow
WOVI
H'00
Overflow
WOVI
Time