h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 433

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

15.4.2
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 15.3. 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 15.4.
Legend:
WOVI: Internal timer interrupt request occurrence
H'FF
H'00
Interval Timer Mode
TCNT value
TCNT
Overflow signal
(internal signal)
OVF
WT/IT = 0
TME = 1
Figure 15.3 Interval Timer Mode Operation
Overflow
WOVI
Figure 15.4 OVF Flag Set Timing
H'FF
Overflow
WOVI
Rev. 3.00 Jan 25, 2006 page 381 of 872
Overflow
WOVI
Section 15 Watchdog Timer (WDT)
H'00
Overflow
WOVI
REJ09B0286-0300
Time