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Section 13 Watchdog Timer
R01UH0134EJ0400 Rev. 4.00 Page 661 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
Section 13 Watchdog Timer
This LSI includes the watchdog timer, 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. This module can simultaneously generate an internal reset signal for the
entire LSI.
This module is a single channel timer that counts up the clock oscillation settling period when the
system leaves software standby mode. It can also be used as a general watchdog timer or interval
timer.
13.1 Features
Can be used to ensure the clock oscillation settling time
This module is used in leaving software standby mode.
Can switch between watchdog timer mode and interval timer mode.
Outputs WDTOVF signal in watchdog timer mode
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.
Interrupt generation in interval timer mode
An interval timer interrupt is generated when the counter overflows.
Choice of eight counter input clocks
Eight clocks (P 1 to P 1/16384) that are obtained by dividing the peripheral clock can be
selected.