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13.1.2
Block Diagram
Figure 13.1 is the block diagram of the WDT.
φ
/2
φ
/64
φ
/128
φ
/256
φ
/512
φ
/1024
φ
/4096
φ
/8192
Internal
clock sources
Clock
Overflow
Clock
select
Interrupt
control
Reset
control
RSTCSR
TCSR:
TCNT:
RSTCSR:
Timer control/status register
Timer counter
Reset control/status register
TCNT
TCSR
Module bus
Bus
interface
Internal data bus
ITI
(interrupt
signal)
WDTOVF
Internal
reset signal
*
WDT
Note:
*
The internal reset signal can be generated by setting the register.
The type of reset can be selected (power-on or manual).
Figure 13.1 WDT Block Diagram
13.1.3
Pin Configuration
Table 13.1 shows the pin configuration.
Table 13.1
Pin Configuration
Pin
Abbreviation
I/O
Function
Watchdog timer overflow
WDTOVF
O
Outputs the counter overflow signal in the
watchdog timer mode
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