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Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
Figure 9-5:
Processor Clock Control Register (PCC) (2/2)
Note: X: don’t care
Caution:
Data is set to the registers by the following sequence:
•
Write the set data to the command register (PHCMD) (see Chapter 3.6.2
“Peripheral Command Register (PHCMD)” on page 105).
•
Write the set data to the destination register (PCC)
Remarks: 1. If it is required to switch to another CPU clock source, it is recommended to monitor the
status of the clock source to be selected before. Switching to an unstable clock source
is not protected by hardware.
2. It is only possible to change the contents of the PCC register for one time after the
occurrence of a Reset or if a power-save mode has been released.
3. After release from Watch mode, Idle mode or Stop mode the register PCC is set to Main
oscillator mode.
After release from Sub-Watch mode the register PCC is set to Main oscillator mode in
case that the bit OSCDIS is cleared (0) or the register PCC is set to Sub-Oscillator
mode if the bit OSCDIS is set (1). The bit OSCDIS can be found in the register Power
Save Mode PSM.
Bit name
Function
CLS,
CKS1, CKS0
Specifies the CPU clock source
CLS
CKS1
CKS0
CPU Clock
0
0
0
Main oscillator
0
0
1
SSCG
0
1
0
PLL (Main oscillator frequency
×
4)
0
1
1
PLL (Main oscillator frequency
×
8)
1
X
X
Sub-Oscillator
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