CHAPTER 5 CLOCK GENERATOR
Preliminary User’s Manual U16315EJ1V0UD
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5.8.5 Register settings
Table 5-7. Clock and Register Setting
Setting Flag
Status Flag
PCC Register
MCM
Register
MOC
Register
RCM
Register
PCC
Register
MCM
Register
f
CPU
Mode
MCC
CSS
MCM0
MSTOP RSTOP
Note 1
CLS
MCS
Ring-OSC oscillating
0
0
1
0
0
0
1
X1 input clock
Note 2
Ring-OSC stopped
0
0
1
0
1
0
1
X1 oscillating
0
0
0
0
0
0
0
Ring-OSC clock
X1 stopped
0
Note 3
0
0
1
0
0
0
X1 oscillating, Ring-OSC oscillating
0
1
1
Note 5
0
Note 6
0
1
1
X1 stopped, Ring-OSC oscillating
1
1
1
Note 5
0
Note 6
0
1
1
X1 oscillating, Ring-OSC stopped
0
1
1
Note 5
0
Note 6
1
1
1
Subsystem clock
Note 4
X1 stopped, Ring-OSC stopped
1
1
1
Note 5
0
Note 6
1
1
1
Notes 1.
Valid only when “clock can be stopped by software” is selected for Ring-OSC by a mask option.
2.
Do not set MCC = 1 or MSTOP = 1 during X1 input clock operation (even if MCC = 1 or MSTOP = 1 is set,
the X1 oscillation does not stop).
3.
Do not set MCC = 1 during Ring-OSC operation (even if MCC = 1 is set, the X1 oscillation does not stop).
To stop X1 oscillation during Ring-OSC operation, use MSTOP.
4.
Shifting to subsystem clock operation mode must be performed from the X1 input clock operation mode.
From subsystem clock operation mode, only X1 input clock operation mode can be shifted to.
5.
Do not set MCM0 = 0 (shifting to Ring-OSC operation) during subsystem clock operation.
6.
Do not set MSTOP = 1 during subsystem clock operation (even if MSTOP = 1 is set, X1 oscillation does
not stop). To stop X1 oscillation during subsystem clock operation, use MCC.