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Chapter 6
Clock Generator
User’s Manual U16702EE3V2UD00
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Extension clock select register (EXCKSEL)
This is an 8-bit register that selects the internal clock. This register can be read or written in 8-bit
or 1-bit units.
Figure 6-3:
Extension Clock Select Register (EXCKSEL) Format
Cautions: 1. Before modifying EXCKSEL register value, corresponding peripheral I/O function
have to be stopped.
2. When set to 1 either bit 5 or 4 of EXCKSEL register, be sure to set bit 4 of OCKS2
register (OCKSEN2 bit) to 1.
Symbol
7
6
5
4
3
2
1
0
Address
After reset
EXCKSEL
0
0
CB1CKSEL CB0CKSEL CS31CKSEL CS30CKSEL AF1CKSEL AF0CKSEL
FFFFF30CH
00H
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
CB1CKSEL
CSIB1 Clock selection
0
Normal clock selection (f
XX
)
1
Extended clock selection (f
PLL_PCKSEL
)
CB0CKSEL
CSIB0 Clock selection
0
Normal clock selection (f
XX
)
1
Extended clock selection (f
PLL_PCKSEL
)
CS31CKSEL
CSI31 Clock selection
0
Normal clock selection (f
XX
)
1
Extended clock selection (f
PLL_PCKSEL
)
CS30CKSEL
CSI30 Clock selection
0
Normal clock selection (f
XX
)
1
Extended clock selection (f
PLL_PCKSEL
)
AF1CKSEL
CAN1 Clock selection
0
Normal clock selection (f
XX
)
1
Extended clock selection (f
PLL_PCKSEL
)
AF0CKSEL
CAN0 Clock selection
0
Normal clock selection (f
XX
)
1
Extended clock selection (f
PLL_PCKSEL
)
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