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CHAPTER 3 CPU AND CONTROL UNITS
3.14
Main Clock Oscillation Stabilization Wait Timer
The main clock oscillation stabilization wait timer is a 23-bit free-run timer that performs
incremental counting in synchronization with the main clock. The main clock oscillation
stabilization wait timer has an interval timer function to generate interrupts repeatedly
at fixed time intervals. This timer is used to secure main clock oscillation stabilization
wait time when main clock oscillation is restarted after it has been stopped by setting
bit0 (OSCDS1) of the oscillation control register (OSCCR) during operation with the
subclock.
The interval time can be selected from three types as follow.
■ Main Clock Oscillation Stabilization Wait Timer
Table 3.14-1 Time Intervals for Main Clock Oscillation Stabilization Wate Timer
1/F
CL
•
F
CL
120
Main clock interval
(about 80 ns)
indicates the main clock oscillation frequency.
Interval time
12
(470 µs)
2
/F
CL
17
2
/F
(13.1 ms)
CL
23
2
/F
(839 ms)
CL
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