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Chapter 18 Timebase Counter
3.Configuration
■ Events that invoke an oscillation stabilization wait using other than the timebase counter
● Wait time after power on: Provided by pin input
● Wait time after changing from subclock to main clock: Using the main oscillation stabilization wait
timer to generate this time is recommended.
● When recovering from main clock oscillation halted: Enabling the main clock oscillation and
waiting for oscillation to stabilize is required.
● Main PLL lock wait time (for main clock operation): Using the timebase timer interrupt to generate
this time is recommended.
• A wait time is required after the main PLL operation is enabled.
• A wait time is required after the main PLL multiplier setting is changed.
3. Configuration
Time-base counter
(when used to generate the oscillation stabilization wait)
CKS1-CKS0
CLKR :bit 1-0
0
0
0
F
/2
1
CL-MAIN
1
0
1
1
F
/2
CL-SUB
F
/2
CL-MAIN
F
CL-SUB
Base clock
(φ2)
250
Figure 3-1
Time-base counter
(26-bit counter)
0
1
2
3
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
1
2
3
4
10
11
12
13
14
2
2
2
2
2
2
2
2
2
- INIT pin input
- Watchdog reset
- STOP
Figure 3-2 Register List
Configuration Diagram
OS1-OS0
0
0
1
1
15
16
17
18
19
20
21
22
23
24
2
2
2
2
2
2
2
2
2
2
ST CR:bit 3-2
φ2 x
0
2
1
φ2 x
11
1
2
φ2 x
2
16
0
φ2 x
2
22
1
Oscillation stabilization
wait control signal
25
26
2
2
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