R01UH0823EJ0100 Rev.1.00
Page 175 of 1823
Jul 31, 2019
RX23W Group
9. Clock Generation Circuit
9.2.3
PLL Control Register (PLLCR)
Note:
Set the PRCR.PRC0 bit to 1 (write enabled) before rewriting this register.
Writing to the PLLCR is prohibited when the PLLCR2.PLLEN bit is 0 (PLL is operating).
PLIDIV[1:0] Bits (PLL Input Frequency Division Ratio Select)
These bits select the frequency division ratio of the PLL clock source.
Set these bits so that the frequency of PLL input signal is within the range of 4 MHz to 12.5 MHz.
STC[5:0] Bits (Frequency Multiplication Factor Select)
These bits select the frequency multiplication factor of the PLL circuit.
Set these bits so that the PLL oscillation frequency is within the range of 24 MHz to 54 MHz.
Address(es): 0008 0028h
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
—
—
STC[5:0]
—
—
—
—
—
—
PLIDIV[1:0]
Value after reset:
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
Bit
Symbol
Bit Name
Description
R/W
b1, b0
PLL Input Frequency
Division Ratio Select
b1 b0
0 0: ×1
0 1: ×1/2
1 0: ×1/4
1 1: Setting prohibited
R/W
b7 to b2
—
Reserved
These bits are read as 0. The write value should be 0.
R/W
b13 to b8
Frequency Multiplication
Factor Select
b13 b8
0 0 0 1 1 1: ×4
0 0 1 0 0 0: ×4.5
0 0 1 0 0 1: ×5
0 0 1 0 1 0: ×5.5
0 0 1 0 1 1: ×6
0 0 1 1 0 0: ×6.5
0 0 1 1 0 1: ×7
0 0 1 1 1 0: ×7.5
0 0 1 1 1 1: ×8
0 1 0 0 0 0: ×8.5
0 1 0 0 0 1: ×9
0 1 0 0 1 0: ×9.5
0 1 0 0 1 1: ×10
0 1 0 1 0 0: ×10.5
0 1 0 1 0 1: ×11
0 1 0 1 1 0: ×11.5
0 1 0 1 1 1: ×12
0 1 1 0 0 0: ×12.5
0 1 1 0 0 1: ×13
0 1 1 0 1 0: ×13.5
Settings other than above are prohibited.
R/W
b15, b14
—
Reserved
These bits are read as 0. The write value should be 0.
R/W