h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 437

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

14.3.3
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 14.5.
If NMI request generation is selected in watchdog timer mode, when TCNT overflows the OVF
bit in TCSR is set to 1 and at the same time an NMI interrupt is requested.
Legend:
WOVI: Interval timer interrupt request generation
H'FF
H'00
TCNT count
TCNT
Overflow signal
(internal signal)
OVF
WT/IT = 0
TME = 1
Timing of Setting of Overflow Flag (OVF)
Figure 14.4 Operation in Interval Timer Mode
Overflow
WOVI
Figure 14.5 Timing of OVF Setting
H'FF
Overflow
WOVI
Rev. 4.00 Jun 06, 2006 page 383 of 1004
Overflow
Section 14 Watchdog Timer (WDT)
WOVI
H'00
Overflow
REJ09B0301-0400
WOVI
Time