System Reset With Wdtovf; Internal Reset With Watchdog Timer - Hitachi SH7032 Hardware Manual

System Reset With WDTOVF

12.4.4
If a WDTOVF signal is input to the RES pin, the chip 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.
Reset signal to
entire system
Figure 12.9 Example of System Reset Circuit Using WDTOVF Signal
12.4.5

Internal Reset With Watchdog Timer

If the RSTE bit is cleared to 0 in watchdog timer mode, the chip will not reset internally when a
TCNT overflow occurs, but TCNT and TCSR in the WDT will reset.
Reset input
SuperH microcomputer
RES
WDTOVF
347