HD64F7050 RENESAS [Renesas Technology Corp], HD64F7050 Datasheet - Page 387

• Manufacturer Part Number: HD64F7050
• Description: 32-Bit RISC Microcomputer SuperH RISC engine Family/
• Manufacturer: RENESAS [Renesas Technology Corp]

12.4.4
If a WDTOVF signal is input to the RES pin, the LSI 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.
12.4.5
If the RSTE bit is cleared to 0 in the watchdog timer mode, the LSI will not reset internally when a
TCNT overflow occurs, but the TCNT and TCSR in the WDT will reset.
System Reset With WDTOVF
Internal Reset With the Watchdog Timer
Figure 12.9 Example of a System Reset Circuit with a WDTOVF
Reset signal to
entire system
Reset input
WDTOVF
WDTOVF
WDTOVF
Rev. 5.00 Jan 06, 2006 page 367 of 818
RES
WDTOVF
SH7050 series
Section 12 Watchdog Timer (WDT)
WDTOVF Signal
WDTOVF
WDTOVF
REJ09B0273-0500