h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 458

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 12 Watchdog Timer
12.3.2
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 12.5. This function can be used to
generate interrupt requests at regular intervals.
Rev. 5.00 Sep 22, 2005 page 432 of 1136
REJ09B0257-0500
Internal
reset signal
Legend:
WT/IT
TME
Note: * The WOVF bit is set to 1 and then cleared to 0 by an internal reset.
Interval Timer Operation
H'FF
H'00
: Timer mode select bit
: Timer enable bit
TCNT value
WT/IT= 1
TME= 1
Figure 12.4 (b) WDT1 Watchdog Timer Operation
Write H'00'
to TCNT
internal reset
is generated
Overflow
WOVF= 1*
515/516 states
WT/IT= 1
TME= 1
Write H'00'
to TCNT
Time