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User’s Manual U15109EJ3V0UD
316
CHAPTER 10 WATCHDOG TIMER FUNCTION
10.1 Functions
The watchdog timer has the following functions.
•
Watchdog timer
•
Interval timer
•
Selecting the oscillation stabilization time
Caution
Use the watchdog timer mode register (WDTM) to select the watchdog timer mode or the interval
timer mode.
Figure 10-1. Block Diagram of Watchdog Timer
Internal bus
OSTS0
OSTS1
OSTS2
OSTS
WDTM4 WDTM3
RUN
WDTM
WDCS
WDCS0
WDCS1
WDCS2
3
Internal reset signal
INTWDT
Note 1
INTWDTM
Note 2
3
Output
controller
Output
controller
Prescaler
Selector
f
XX
/2
24
f
XX
/2
12
f
XX
/2
22
f
XX
/2
21
f
XX
/2
20
f
XX
/2
19
f
XX
/2
18
f
XX
/2
17
f
XX
/2
16
RUN
Clear
Selector
OSC
Notes 1.
In watchdog timer mode
2.
In interval timer mode
Remark
f
XX
: Main clock frequency