R01UH0822EJ0100 Rev.1.00
Page 131 of 1041
Jul 31, 2019
RX13T Group
9. Clock Generation Circuit
9.2
Register Descriptions
9.2.1
System Clock Control Register (SCKCR)
Note:
Set the PRCR.PRC0 bit to 1 (write enabled) before rewriting this register.
This register cannot be rewritten while the flash memory is being programmed or erased.
When an instruction for writing to SCKCR or SCKCR3 is to follow writing to the SCKCR register, do so in accord with
the procedure below.
Address(es): 0008 0020h
b31
b30
b29
b28
b27
b26
b25
b24
b23
b22
b21
b20
b19
b18
b17
b16
FCK[3:0]
ICK[3:0]
—
—
—
—
—
—
—
—
Value after reset:
0
0
1
1
0
0
1
1
0
0
0
0
0
0
0
0
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
—
—
—
—
PCKB[3:0]
—
—
—
—
PCKD[3:0]
Value after reset:
0
0
0
0
0
0
1
1
0
0
0
0
0
0
1
1
Bit
Symbol
Bit Name
Description
R/W
b3 to b0
Peripheral Module Clock D
(PCLKD) Select
b3 b0
0 0 0 0: ×1
0 0 0 1: ×1/2
0 0 1 0: ×1/4
0 0 1 1: ×1/8
0 1 0 0: ×1/16
0 1 0 1: ×1/32
0 1 1 0: ×1/64
Settings other than above are prohibited.
R/W
b7 to b4
—
Reserved
These bits are read as 0. The write value should be 0.
R/W
b11 to b8
Peripheral Module Clock B
(PCLKB) Select
b11 b8
0 0 0 0: ×1
0 0 0 1: ×1/2
0 0 1 0: ×1/4
0 0 1 1: ×1/8
0 1 0 0: ×1/16
0 1 0 1: ×1/32
0 1 1 0: ×1/64
Settings other than above are prohibited.
R/W
b19 to b12 —
Reserved
These bits are read as 0. The write value should be 0.
R/W
b23 to b20 —
Reserved
These bits are read as 0. The write value should be 0.
R/W
b27 to b24 ICK[3:0]
System Clock (ICLK)
Select
b27 b24
0 0 0 0: ×1
0 0 0 1: ×1/2
0 0 1 0: ×1/4
0 0 1 1: ×1/8
0 1 0 0: ×1/16
0 1 0 1: ×1/32
0 1 1 0: ×1/64
Settings other than above are prohibited.
R/W
b31 to b28 FCK[3:0]
FlashIF Clock (FCLK)
Select
b31 b28
0 0 0 0: ×1
0 0 0 1: ×1/2
0 0 1 0: ×1/4
0 0 1 1: ×1/8
0 1 0 0: ×1/16
0 1 0 1: ×1/32
0 1 1 0: ×1/64
Settings other than above are prohibited.
R/W