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Preliminary User’s Manual U15839EE1V0UM00
Chapter 12
Watchdog Timer Function
12.1 Functions
The watchdog timer has the following functions.
•
Watchdog Timer with non maskable interrupt INTWDT
•
Watchdog Timer with hardware RESET.
Figure 12-1:
Block Diagram of Watchdog Timer
Remark:
f
WD
: Watchdog Timer clock frequency (depends on clock tree settings)
(1)
Interrupt mode
This mode detects program runaway. When runaway is detected, a non-maskable interrupt can be
generated.
(2)
RESET mode
This mode detects program runaway. When runaway is detected, a hardware RESET is
generated.
f
Clear
Prescaler
Internal bus
Selector
f
x
2
13
f
x
2
14
f
x
2
15
f
x
2
16
f
x
2
17
f
x
2
18
f
x
2
19
f
x
2
21
Output
Control
Circuit
RESET
INTWDT
WDCS2 WDCS1 WDCS0
WDCS
RUN
WDTM4 WDTM3
WDTM
WDT
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