Fujitsu F2MC-8FX Hardware Manual page 491

Example Operation Flowchart for the Clock Supervisor
Figure 26.4-1 Example Operation Flowchart for the Clock Supervisor
(2)
CSV : Clock supervisor
(1) After the power is turned on, the main clock operation starts after the oscillation stabilization wait time
generated by the main oscillation has elapsed.
(2) If the main clock halts at power on, the device remains in the reset state (oscillation stabilization wait
state). The operation changes to the main clock, after the oscillation restarts and the oscillation
stabilization wait time elapsed.
(3) If an oscillation halt is detected during main clock operation, the operating clock is switched to the CR
clock and a reset is generated.
(4) If the main oscillation continues (oscillation does not halt), the device continues to run using the main
clock.
(5) If an external reset occurs during the CR clock operation, operation changes to the main clock.
However, if the oscillation is halted at this time, another CSV reset is generated and the device returns
to CR clock operation.
No
Wait for reset state
(oscillation
stabilization wait)
Oscillation
restarts
Yes
CR clock
operation
(3)
CSV reset
generated
Reset is cleared
(CR clock operation)
CHAPTER 26 CLOCK SUPERVISOR
Power on
Has the main
oscillation started?
(1)
Yes
Main clock
operation
(4)
Oscillation
halted?
(5)
External reset
generated
No
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