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Symbol
<7>
PCC
MCC
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Notes 1. Bit 5 is Read Only.
2. When the CPU is operating on the subsystem clock, MCC should be used to stop the main system clock
oscillation. A STOP instruction should not be used.
Caution
Bit 3 must be set to 0.
Remarks 1. f
2. f
158
CHAPTER 7 CLOCK GENERATOR
Figure 7-3. Processor Clock Control Register Format
<6>
<5>
<4>
3
FRC
CLS
CSS
0
: Main system clock oscillation frequency
X
: Subsystem clock oscillation frequency
XT
2
1
0
Address
PCC2
PCC1
PCC0
FFFBH
R/W
CSS
0
1
Other than above
R
CLS
0
1
R/W
FRC
0
1
R/W
MCC
0
1
When Reset
R/W
Note 1
04H
R/W
PCC2 PCC1 PCC0
CPU Clock (f
selection
0
0
0
f
X
0
0
1
f
/2
X
0
1
0
f
/2
2
X
3
0
1
1
f
/2
X
4
1
0
0
f
/2
X
0
0
0
f
XT
0
0
1
0
1
0
0
1
1
1
0
0
Setting prohibited
CPU Clock Status
Main system clock
Subsystem clock
Subsystem Clock Feedback Resistor Selection
On-chip feedback resistor used
On-chip feedback resistor not used
Main System Clock Oscillation Control
Oscillation possible
Oscillation stopped
)
CPU
Note 2
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