12.1.2 Block Diagram
Figure 12-1 shows a block diagram of the WDT.
Figure 12-1 WDT Block Diagram
12.1.3 Pin Configuration
Table 12-1 describes the WDT output pin.
Table 12-1 WDT Pin
Name
Abbreviation
I/O
Function
Reset output
RESO
Output
*
External output of the watchdog timer reset signal
Note:
*
Open-drain output.
ø/2
ø/32
ø/64
ø/128
ø/256
ø/512
ø/2048
ø/4096
TCNT
TCSR
RSTCSR
Reset control
Interrupt signal
Reset
(internal, external)
(interval timer)
Interrupt
control
Overflow
Clock
Clock
selector
Read/
write
control
Internal
data bus
Internal clock sources
Legend
TCNT:
TCSR:
RSTCSR:
Timer counter
Timer control/status register
Reset control/status register
422
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