SH7021 datasheet(355/509 Pages) RENESAS

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SH7021 Datasheet(PDF) 355 Page - Renesas Technology Corp

Part #	SH7021

Description	SuperH??RISC engine

PDF	509 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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355 / 509 page

RENESAS 339

12.4.4

System Reset With

WDTOVF

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.

Reset input

Reset signal to

entire system

SuperH

microprocessor

RES

WDTOVF

Figure 12.9 Example of a System Reset Circuit with a

WDTOVF Signal

12.4.5

Internal Reset With the Watchdog Timer

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 WDT will reset.

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