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CHAPTER 24 STANDBY FUNCTION
User’s Manual U12697EJ3V0UM
Figure 24-3. Format of Clock Status Register (PCS)
Address: 0FFCEH After reset: 32H R
Symbol
7
6
5
4
3
2
1
0
PCS
SBK
CK2
CK1
CK0
0
MCK
1
CST
SBK
Feedback resistor state for subsystem clock
0
Use internal feedback resistors.
1
Do not use internal feedback resistors.
CK2
CK1
CK0
CPU clock operating frequency
0
0
0
f
XX
0
0
1
f
XX
/2
0
1
0
f
XX
/4
0
1
1
f
XX
/8
1
1
1
f
XT
(Recommended)
1
–
–
f
XT
MCK
Main system clock oscillation control
0
Oscillator operation.
1
Oscillator stop.
CST
CPU clock state
0
Main system clock operation
1
Subsystem clock operation
Remark
×
: don’t care