Fujitsu MB91460 SERIES FR60 User Manual page 311

7. Q & A
7.1 What are the types of interval time (wait time) and how are they selected?
There are 3 types of interval time, and they are set with the interval selection bit (OSCRH.WS[0:1]).
Interval time
12
To set the value to 2 /F
17
To set the value to 2 /F
23
To set the value to2 /F
Note: Setting (WS[1:0]="00") is prohibited.
7.2 How do I select the count clock?
The count clock is the main clock (source oscillation). (Cannot be selected.)
7.3 How is the main clock oscillation stability wait timer count operation enabled/
disabled?
Sets with the timer operation enable bit (OSCRH.WEN).
To stop the main clock oscillation stability wait timer
To start the main clock oscillation stability wait timer
7.4 How is the main clock oscillation stability wait timer cleared?
The following methods are used to clear the main clock oscillation stability wait timer.
• Sets with the clear bit (OSCRH.WCL).
To clear the main clock oscillation stability wait timer
• Performs a reset.
Clears the free run timer with the operation initialization reset (INIT terminal input, watchdog reset).
(Value is held without being cleared even if a software reset is performed.)
• The overflow (Next of "FFFFFFh") of the main clock oscillation stability wait timer causes the count value to
be reset to "000000
7.5 What happens with the interrupt-associated registers?
Setting the interrupt vector and interrupt level of the main clock oscillation stability wait timer
The relationship between the interrupt level and the interrupt vector is shown in the following table.
Refer to "Chapter 24 Interrupt Control (Page
Interrupt vector (Default)
#143
Address: 0FFDC0h
As the interrupt request flag (OSCRH.WIF) is not automatically cleared, clear it before returning to interrupt
processing by the software. (Writes "0" in the WIF bit.)
Count period
Interval selection bit (WS[1:0])
Set the value to "01"
CL-MAIN
Set the value to "10"
CL-MAIN
Set the value to "11"
CL-MAIN
Operation
Operation
".
H
Chapter 22 Main Oscillation Stabilisation Timer
Timer operation enable bit (WEN)
Set the value to "0"
Set the value to "1"
Writes "1"
No.311)" for the interrupt level and interrupt vector.
Interrupt level setting bit (ICR4-ICR0)
Interrupt level register (ICR63)
Address: 047Fh
Interval (Wait time) Example
At F = 4.00MHz
CLKP
1.00ms
32.7ms
2.00 s
Clear bit (WCL)
7.Q & A
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