Switching Between Watchdog Timer Mode And Interval Timer Mode - Renesas H8S Family Hardware Manual

Switching between Watchdog Timer Mode and Interval Timer Mode

If the mode is switched from/to watchdog timer to/from interval timer, while the WDT is

operating, errors could occur in the operation. Software must stop the watchdog timer (by clearing

the TME bit to 0) before switching the mode.

System Reset by RESO Signal

Inputting the RESO output signal to the RES pin of this LSI prevents the LSI from being

initialized correctly; the RESO signal must not be logically connected to the RES pin of the LSI.

To reset the entire system by the RESO signal, use the circuit as shown in figure 12.8.

Reset signal for entire system

Figure 12.8 Sample Circuit for Resetting the System by the RESO Signal

Section 12 Watchdog Timer (WDT)

Rev. 1.00 Mar. 12, 2008 Page 427 of 1178

REJ09B0403-0100