User’s Manual U11969EJ3V0UM00
137
CHAPTER 6 CLOCK GENERATOR FUNCTION
Examples of the clock used in the PLL mode
Multiplication
Internal System Clock Frequency (
φ
) [MHz]
External Oscillator/External Clock Frequency (f
XX
) [MHz]
1-x multiplication
33.000
33.000
Note
25.000
25.000
Note
20.000
20.000
Note
16.000
16.000
5-x multiplication
33.000
6.6000
25.000
5.0000
20.000
4.0000
16.000
3.2000
Note Cannot be oscillated by a resonator. Oscillate not higher than 16 MHz.
6.3.3 Clock control register (CKC)
This is an 8-bit register which controls the internal system clock frequency. It can be written only by a specific
combination of instruction sequences so that its contents are not written by mistake due to erroneous program
execution.
This register can be read/written in 8- or 1-bit units.
Bit Position
Bit Name
Function
1, 0
CKDIV1,
Clock Divide
CKDIV0
Sets the internal system clock frequency in the PLL mode.
Operation Mode
Pins
CKC
Internal System
CKSEL
PLLSEL
CKDIV1
CKDIV0
Clock (
φ
)
Direct mode
H
Note
0
0
f
XX
/2
H
Note
Any values
1
Setting prohibited
H
Note
1
Any values Setting prohibited
PLL mode (1-x
L
L
0
0
f
XX
/2
multiplication)
L
L
0
1
Setting prohibited
L
L
1
0
f
XX
/5
L
L
1
1
f
XX
/10
PLL mode (5-x
L
H
0
0
f
XX
/5
multiplication)
L
H
0
1
Setting prohibited
L
H
1
0
f
XX
L
H
1
1
f
XX
/2
Note Connect V
DD
or V
SS
directly (refer to 2.4 Pin I/O Circuit Type and
Connection of Unused Pins).
Remark
H : High level input
L : Low level input
f
XX
: Input clock
Address
FFFFF072H
7
0
CKC
6
0
5
0
4
0
3
0
2
0
1
CKDIV1
0
CKDIV0
After reset
00H
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