h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 319

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

10.3.2
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 10.3. 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 bit of TCSR is set to 1. The timing is shown figure 10.4.
WOVI : Internal timer interrupt request occurrence
H'FF
H'00
Interval Timer Mode
TCNT value
φ
TCNT
Overflow signal
(internal signal)
OVF
WT/
TME = 1
= 0
Figure 10.3 Interval Timer Mode Operation
Overflow
Figure 10.4 OVF Flag Set Timing
WOVI
H'FF
Overflow
WOVI
Overflow
WOVI
Rev. 2.00, 03/04, page 287 of 534
H'00
Overflow
WOVI
Time