FUJITSU MB91460 SERIES FR60 User Manual
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Chapter 18 Timebase Counter
7.Q&A
7.2 How do I set the oscillation stabilization wait time without generating it
automatically?
The settings described below for various cases are required.
7.3 What is the clear timing for the timebase counter?
• The timebase counter is only cleared automatically by INIT pin input.
The timebase counter automatically starts counting after being cleared.
• The timebase counter can also be cleared by software.
Chapter 19 Timebase Timer (Page No.263)
State (before
transition)
Oscillation
Condition (after
transition)
Is oscillation
stabilization wait
required?
To set the oscillation
stabilization wait time
PLL
Main
Sub
Wait time after power on
Ч
Ч
Ч
Operation after INIT
signal input defaults to
main clock (1/2)
(Initial value)
Main clock
oscillation
stabilization wait
is required
As the automatic oscillation
stabilization wait (minimum
value) is too short, the width of
the INIT pin must be sufficient
to provide the stabilization time.
Subclock operation
(main clock halted)
Ч
Ч
O
Sub sleep, sub stop
(main clock halted)
Ч
Ч
O
Main clock oscillation
stabilization wait
Ч
Ч
O/
×
State (before
transition)
Oscillation
Main clock
oscillation enabled
Is oscillation
stabilization wait
required?
To set the oscillation
stabilization wait time
PLL
Main
Sub
Subclock operation
(main clock halted)
Ч
Ч
O
Main clock running
Main clock
oscillation
stabilization wait
is required
Using the main clock oscillation
stabilization wait timer to
generate the time is
recommended.
State (before
transition)
Oscillation
Main PLL running
and enabled
Is oscillation
stabilization wait
required?
To set the oscillation
stabilization wait time
PLL
Main
Sub
Subclock running (main
clock running)
×
O
O
Start main PLL
oscillation/
Change PLL
multiplier setting
Main PLL lock
wait required
Using the timebase timer to
generate the main PLL lock wait
time is recommended.
Main clock (1/2) running
×
O
O
O: Oscillation running,
×: Oscillation halted