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13.4.4
System Reset With
WDTOVF
If a
WDTOVF
signal is input to the
RES
pin, the LSI cannot initialize correctly.
Avoid logical input of the
WDTOVF
output signal to the
RES
input pin. To reset the entire system
with the
WDTOVF
signal, use the circuit shown in figure 13.9.
Reset input
Reset signal to
entire system
SH7040 Series
RES
WDTOVF
Figure 13.9 Example of a System Reset Circuit with a
WDTOVF
Signal
13.4.5
Internal Reset with the Watchdog Timer
If the RSTE bit is cleared to 0 in the watchdog timer mode, the LSI will not reset internally when a
TCNT overflow occurs, but the TCNT and TCSR in the WDT will reset.
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