h8s-2169 Renesas Electronics Corporation., h8s-2169 Datasheet - Page 447

• Manufacturer Part Number: h8s-2169
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

14.3.2
To use the WDT as an interval timer, clear the WT/IT bit in TCSR to 0 and set the TME bit to 1.
An interval timer interrupt (WOVI) is generated each time TCNT overflows, provided that the
WDT is operating as an interval timer, as shown in figure 14.4. This function can be used to
generate interrupt requests at regular intervals.
RESO signal
Internal reset signal
WT/IT: Timer mode select bit
TME:
OVF:
Note: * Cleared to 0 by an internal reset when OVF is set to 1. XRST is cleared to 0.
Interval Timer Operation
Timer enable bit
Overflow flag
Figure 14.3 Operation in Watchdog Timer Mode (RST/NMI
H'FF
H'00
TCNT value
WT/IT = 1
TME = 1
H'00 written
to TCNT
RESO and internal
reset generated
Overflow
OVF = 1 *
132 system
clock periods
Rev. 3.00 Jan 18, 2006 page 419 of 1044
518 system
clock periods
Section 14 Watchdog Timer (WDT)
WT/IT = 1
TME = 1
NMI = 1)
NMI
NMI
H'00 written
to TCNT
REJ09B0280-0300
Time