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Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
Figure 9-2:
Clock Control Register (CKC) (2/2)
Cautions: 1. Data is set to the CKC register 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 (CKC)
2. If PLL or SSCG operation is required, the PLLEN bit and the SCEN bit are allowed
to be set (1) when the system remains in the main-oscillation mode (CPU and
peripherals are using the main-oscillator as the clock supply).
To write data to the CKC register, use the store instruction (ST/SST) and bit manipulation instruction
(SET1/CLR1/NOT1).
The contents of this register can be read in the normal sequence.
Bit name
Function
WTSEL1
Sub-clock source select bit
0: Main oscillator/128 is clock source for sub-clock
1: Sub-oscillator is clock source for sub-clock
WTSEL0
Sub-clock divider select for f
CKSEL2
0: f
CKSEL2
= sub-clock/4
1: f
CKSEL2
= sub-clock/32
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