Fujitsu F2MC-8L F202RA, Hardware Manual

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54
CHAPTER 3 CPU
3.6.2 Clock Controller
The clock controller consists of the following six blocks:
• Oscillation circuit
• System clock selector
• Clock controller
• Oscillation stabilization wait time selector
• System clock control register (SYCC)
• Standby control register (STBC)
■
Block Diagram of Clock Controller
Figure 3.6-4 is a block diagram of the clock controller.
Figure 3.6-4 Block Diagram of Clock Controller
S TP
S LP S PL R S T
S CM WT1 WT0 C S 1 C S 0
2
14
/F
CH
2
17
/FCH
2
1 8
/FCH
1t
IN S T
1t
IN S T
F
CH
t
IN S T
S t a nd b y control regi s ter ( S TBC)
Pin control
S top
S leep
Clock for time- bas e
timer
1/2 fre qu ency
Clock
gener a tor
S y s tem clock s elector
Pre- s c a ler
1/4 fre qu ency
1/ 8 fre qu ency
1/16 fre qu ency
1/64 fre qu ency
S elector
Clock
control
circ
u it
Su pplied to the CPU
Su pplied to peripher a l
circ u it s
From the
time-
bas e
timer
O s cill a tion
s t ab iliz a tion
w a it time
s elector
S y s tem clock control regi s ter ( S YCC)
: O s cill a tion fre qu ency
: In s tr u ction cycle