SH7040 Datasheet, PDF (505/923 Pages) Renesas Technology Corp – Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

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
SH7040 Series
RES
Reset signal to
entire system
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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