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User’s Manual U15104EJ2V0UD
CHAPTER 8 WATCHDOG TIMER
8.1 Functions of Watchdog Timer
The watchdog timer has the following functions.
• Watchdog timer
• Interval timer
• Selecting oscillation stabilization time
Caution
Select the watchdog timer mode or the interval timer mode using the watchdog timer mode
register (WDTM). (The watchdog timer and interval timer cannot be used simultaneously.)
Figure 8-1 shows a block diagram.
Figure 8-1. Block Diagram of Watchdog Timer
f
X
/2
8
RUN
Clock
input
controller
Divider
Divided
clock
selector
Output
controller
INTWDT
RESET
WDT mode signal
3
Division mode
selector
OSTS2 OSTS1 OSTS0
WDCS2 WDCS1 WDCS0
Internal bus
RUN WDTM4 WDTM3
Oscillation stabilization
time select register (OSTS)
Watchdog timer clock
select register (WDCS)
Watchdog timer mode
register (WDTM)
Содержание mPD178053
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