Fujitsu 8FX

MB95630H Series
38 FUJITSU SEMICONDUCTOR LIMITED MN702-00009-2v0-E
CHAPTER 3 CLOCK CONTROLLER
3.4 Clock Modes
■ Clock Mode State Transition Diagram
There are five clock modes: main clock mode, subclock mode, main CR clock mode, main CR
PLL clock mode and sub-CR clock mode. The device can switch between these modes
according to the settings in the system clock control register (SYCC).
Figure 3.4-1 Clock Mode State Transition Diagram
(19)
Power on
Reset state
Main CR clock
oscillation stabilization
wait time
+
sub-CR clock
oscillation stabilization
wait time
Main CR PLL clock
(or main CR clock)
oscillation stabilization
wait time
Main CR clock
(or main CR PLL clock)
oscillation stabilization
Sub-CR clock
oscillation
stabilization
wait time
Sub-CR clock mode
Main CR clock mode
(or main CR PLL
clock mode)
Main CR clock mode
(1)
(2)
(5)
(7)
(4)
(11)
(17)
(12)
A reset occurs in any other state.
<1>
Main clock mode
(10)
(8)
Main clock
oscillation
stabilization
wait time
(6)
Subclock
oscillation
stabilization
wait time
Main clock
oscillation
stabilization
wait time
Subclock mode
Subclock
oscillation
stabilization
wait time
Sub-CR clock
oscillation
stabilization
wait time
(15)
(16)
(20)
(9)
(3)
(14)
(18)
(13)