
GMS81C5108
38
JUNE 2001 Ver 1.0
Figure 10-4 System Clock Switching Timing
Operation clock
~~
~~
Sub-clock operation
Main-clock operation
Sub freq. clock
Main freq. clock
(X
IN
pin)
(SX
IN
pin)
Changed to the Sub-clock
SCMR
←
XXXX XX10
B
~~
~~
~~
Operation clock
~~
Main-clock operation
Stabilizing Time
>
60ms
Sub freq. clock
Main freq. clock
(X
IN
pin)
(SX
IN
pin)
Changed to the Transition
Changed to the Main-clock
SCMR
←
XXXX XX10
B
SCMR
←
XXXX XX00
B
~~
~~
Sub-clock operation
~~
(a) Main active mode
→
→
→
→
Sub active mode
(b) Sub active mode
→
→
→
→
Main active mode
or XXXX XX01
B
Turn off main clock
SCMR
←
XXXX XX11
B
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