System Reset With Wdtovf; Internal Reset With The Watchdog Timer - Hitachi SH7095 Hardware User Manual

12.4.4

System Reset With WDTOVF

If a WDTOVF signal is input to the RES pin, the device 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 12.9.
Figure 12.9 Example of a System Reset Circuit with a WDTOVF Signal
12.4.5

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
WTCNT overflow occurs, but the WTCNT and WTCSR in the WDT will reset.
Hitachi 321