R01UH0823EJ0100 Rev.1.00
Page 170 of 1823
Jul 31, 2019
RX23W Group
9. Clock Generation Circuit
Figure 9.1
Block Diagram of Clock Generation Circuit
EXTAL
XTAL
SCKCR
ICK[3:0]
System clock (ICLK)
To CPU, DMAC, DTC, ROM,
and RAM
Peripheral module clock
(PCLKA, PCLKB, PCLKD)
To peripheral module
SCKCR
XCOUT
XCIN
Sub-clock
IWDT-dedicated low-speed clock
RTC-dedicated clock
To RTC
IWDT-dedicated clock
To IWDT
PLL
circuit
Frequency
divider
FCK[3:0]
FlashIF clock (FCLK)
To FlashIF
SCKCR
CKSEL[2:0]
SCKCR3
HOCO clock
LOCO clock
Main clock
Frequency
divider
PLIDIV[1:0]
PLLCR
STC[5:0]
PLLCR
PCKA[3:0], PCKB[3:0],
PCKD[3:0]
High-speed
on-chip oscillator
Low-speed
on-chip oscillator
1/1
CAC clock
To CAC
(CACILCLK)
(CACLCLK)
(CACHCLK)
(CACSCLK)
(CACMCLK)
1/2
1/4
1/8
1/16
1/32
1/64
USB clock (UCLK)
To USB
CKOSEL[2:0]
CKOCR
CLKOUT pin
1/1
1/2
1/4
1/8
1/16
Frequency
divider
IWDT-dedicated
on-chip oscillator
CKODIV[2:0]
CKOCR
PLL
circuit
Frequency
divider
UPLIDIV[1:0]
UPLLCR
USTC[5:0]
UPLLCR
UPLLCR
LPCNTCKSEL
LPTCR1
Low power timer clock (LPTCLK)
To low power timer
SSI clock (SSISCK)
To SSI
UCKUPLLSEL
CAN clock
To RSCAN
(CANMCLK)
Wait
control
MSTS[4:0]
MOSCWTCR
Sel
ec
tor
Se
le
ct
or
Se
le
ct
or
Sel
ecto
r
Se
le
ct
or
Se
le
ct
o
r
Se
le
ct
or
Sub-clock
oscillator
Main clock
oscillator
XTAL2_RF
XTAL1_RF
Dedicated clock for Bluetooth
CLKOUT_RF pin
Bluetooth-dedicated
low speed on-chip
oscillator
Bluetooth-dedicated clock (BLECLK)
To BLE
Bluetooth-dedicated low-speed clock (BLELOCO)
To BLE
Frequency
divider
Bluetooth-dedicated low speed clock
(RTCSCLK)
(IWDTCLK)
Dedicated clock
oscillator for
Bluetooth
Specified from Bluetooth middleware
1/8
1/16
1/32