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15.3.3
Internal Reset Signal Generation Timing
When TCNT overflows in watchdog timer mode, the OVF bit in TCSR is set to 1. When the
RST/
NMI
bit is set to 1 here, the internal reset signal is generated for the entire LSI. The timing is
shown in figure 15.5.
φ
TCNT
H'FF
H'00
518 states
Overflow signal
(internal signal)
OVF
Internal reset
signal
Figure 15.5 Internal Reset Signal Generation Timing
15.4 Interrupt
Sources
During interval timer mode operation, an overflow generates an interval timer interrupt (WOVI).
The interval timer interrupt is requested whenever the OVF flag is set to 1 in TCSR. The OVF flag
must be cleared to 0 in the interrupt handling routine.
When the NMI interrupt request is selected in watchdog timer mode, an NMI interrupt request is
generated by an overflow.
Table 15.1 Interrupt Source
Name
Interrupt Source
Interrupt Flag
WOVI TCNT
overflow
OVF
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