FUJITSU F2MCTM-16LX - Manual (Page 140)

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CHAPTER 7 RESETS
Figure 7.2-1 Oscillation Stabilization Wait Times at a Power-on Reset
Note:
Ceramic and crystal oscillators generally require an oscillation stabilization wait time of several
milliseconds to some tens of milliseconds, until stabilization at a natural frequency is attained after
starts oscillation. A proper oscillation stabilization wait time must be set for the particular oscillator
used.
See "5.6 Oscillation Stabilization Wait Interval", for details about oscillation stabilization wait times.
■ Oscillation Stabilization Wait and Reset State
A reset operation in response to a power-on reset and other resets during stop mode or sub-clock mode is
performed after the oscillation stabilization wait time has elapsed. This time interval is generated by the
timebase timer. If the external reset has not been cleared after the interval, the reset operation is performed
after the external reset is cleared.
Vcc
CLK
2 15 /HCLK 2 15 /HCLK
CPU
operation
Stabilization wait
time of voltage
step-down circuit Oscillation
stabilization
wait time