Chapter 11
Watchdog Timer
Operation XI - 7
11.3 Operation
11.3.1 Oscillation Stabilization Wait Operation
■ Oscillation Stabilization Wait Operation
The oscillation stabilization wait operation is for the oscillation circuit recovering from stop mode.
The oscillation stabilization wait time is automatically inserted when the reset state is released.
The oscillation stabilization wait is not operated with the self-reset by the reset control register (RSTCTR).
The oscillation stabilization wait is operated even if the WDCNE flag of the watchdog timer control register
(WDCTR) is “0”.
■ Oscillation Stabilization Wait Time
The oscillation stabilization wait time is 26.21 ms (when the oscillation frequency is 10 MHz). The timer to count
the oscillation stabilization wait time is used as watchdog timer. It also is used as a incorrect code execution
watchdog timer except at reset releasing. The watchdog timer is initialized at reset state and starts to count the
oscillation frequency as a clock source. It continues to count as a watchdog timer after the oscillation stabilization
wait stops.
Figure:11.3.1 Oscillation Stabilization Wait Operation (When Reset is Released)
NRSTpin
Internal reset signal
IOCLK
T1
T1=2
18
/fck
T2=16xIOCLK
IOCLK: Refer to Chapter 3 Clock Generator
T2
fck: Oscillation frequency
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