SH7032 Datasheet, PDF (377/687 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 12 Watchdog Timer (WDT)
12.4.4 System Reset With WDTOVF
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 input
SuperH microcomputer
RES
Reset signal to
entire system
WDTOVF
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.
Rev. 7.00 Jan 31, 2006 page 351 of 658
REJ09B0272-0700