HD6417618 datasheet(239/646 Pages) RENESAS

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Section 9 Watchdog Timer (WDT)

WDTS300B_000020030900

Rev. 6.00 Jun. 12, 2007 Page 207 of 610

REJ09B0131-0600

Section 9 Watchdog Timer (WDT)

This LSI includes the watchdog timer (WDT) that can reset this LSI by the overflow of the

counter when the value of the counter has not been updated because of a system runaway.

The WDT is a single-channel timer that uses a peripheral clock as an input and counts the clock

settling time when leaving software standby mode and temporary standby state, such as frequency

changes. It can also be used as an interval timer.

9.1

Features

The WDT has the following features:

• Can be used to ensure the clock settling time.

The WDT can be used when leaving software standby mode and the temporary standby state

which occur when the clock frequency is changed.

• Can switch between watchdog timer mode and interval timer mode.

• Internal resets in watchdog timer mode

Internal resets are generated when the counter overflows.

• Interrupts are generated in interval timer mode

Interval timer interrupts are generated when the counter overflows.

• Choice of eight counter input clocks

Eight clocks (

×1 to ×1/4096) that are obtained by dividing the peripheral clock can be chosen.

HD6417618 Datasheet(PDF) 239 Page - Renesas Technology Corp