DS72030W200FPV Renesas Electronics America, DS72030W200FPV Datasheet - Page 707

Manufacturer Part Number

DS72030W200FPV

MPU, 32BIT, SH7203, ROMLESS, 240QFP

Manufacturer

Renesas Electronics America

Program Memory Size

Digital Ic Case Style

Supply Voltage Range

1.1V To 1.3V

Operating Temperature Range

-20Â°C To +85Â°C

Rohs Compliant

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

This LSI includes the watchdog timer (WDT), which externally outputs an overflow signal

(WDTOVF) on overflow of the counter when the value of the counter has not been updated

because of a system malfunction. The WDT can simultaneously generate an internal reset signal

for the entire LSI.

The WDT is a single channel timer that counts up the clock oscillation settling period when the

system leaves software standby mode or the temporary standby periods that occur when the clock

frequency is changed. It can also be used as a general watchdog timer or interval timer.

• Can be used to ensure the clock oscillation settling time

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

• Outputs WDTOVF signal in watchdog timer mode

• Interrupt generation in interval timer mode

• Choice of eight counter input clocks

The WDT is used in leaving software standby mode or the temporary standby periods that

occur when the clock frequency is changed.

When the counter overflows in watchdog timer mode, the WDTOVF signal is output

externally. It is possible to select whether to reset the LSI internally when this happens. Either

the power-on reset or manual reset signal can be selected as the internal reset type.

An interval timer interrupt is generated when the counter overflows.

Eight clocks (Pφ × 1 to Pφ × 1/16384) that are obtained by dividing the peripheral clock can be

Section 13 Watchdog Timer (WDT)

Rev. 3.00 Sep. 28, 2009 Page 675 of 1650

Section 13 Watchdog Timer (WDT)

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