HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 205

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

This LSI includes the watchdog timer (WDT), which enables reset the LSI on overflow of the
counter when the value of the counter has not been updated because of a system malfunction.
The WDT is a single channel timer that counts up the clock-settling period when the system leaves
standby mode or the temporary periods on standby that occur when the clock frequency is
changed. It can also be used as a watchdog timer or interval timer.
5.1
The WDT has the following features:
• Can be used to ensure the clock settling time: The WDT is used in leaving standby mode or the
• Can switch between watchdog timer mode and interval timer mode.
• Generates internal resets in watchdog timer mode: Internal resets occur after counter overflow.
• Interrupt generation in interval timer mode
• Choice of eight counter input clocks
temporary periods on standby that occur when the clock frequency is changed.
Power-on reset or manual reset can be selected as a reset.
An interval timer interrupt is generated when the counter overflows.
Eight clocks (×1 to ×1/4096) that are obtained by dividing the peripheral clock can be selected.
Features
Section 5 Watchdog Timer (WDT)
Rev. 4.00 Sep. 14, 2005 Page 155 of 982
Section 5 Watchdog Timer (WDT)
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