HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 559

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

13.4.4
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 13.9.
13.4.5
If the RSTE bit is cleared to 0 in watchdog timer mode, the chip will not reset internally when a
WTCNT overflow occurs, but WTCNT and WTCSR in the WDT will reset.
System Reset with WDTOVF
Internal Reset in Watchdog Timer Mode
Figure 13.9 Example of Circuit for System Reset with WDTOVF Signal
Reset signal to
entire system
Reset input
RES
WDTOVF
Chip
545