R01UH0822EJ0100 Rev.1.00
Page 130 of 1041
Jul 31, 2019
RX13T Group
9. Clock Generation Circuit
Figure 9.1
Block Diagram of Clock Generation Circuit
lists the I/O pins of the clock generation circuit.
Table 9.2
I/O Pins of Clock Generation Circuit
Pin Name
I/O
Description
XTAL
Output
These pins are used to connect a crystal. The EXTAL pin can also be used to input an
external clock. For details, refer to section 9.3.2, External Clock Input.
EXTAL
Input
EXTAL
XTAL
SCKCR
ICK[3:0]
System clock (ICLK)
To CPU, DTC, ROM,
and RAM
Peripheral module clock
(PCLKB, PCLKD)
To peripheral module
SCKCR
IWDT-dedicated low-speed clock
IWDT-dedicated clock (IWDTCLK)
To IWDT
Main clock
oscillator
PLL
circuit
Frequency
divider
FCK[3:0]
FlashIF clock (FCLK)
To FlashIF
SCKCR
Sel
ec
to
r
CKSEL[2:0]
SCKCR3
HOCO clock
LOCO clock
Main clock
Frequency
divider
PLIDIV[1:0]
PLLCR
STC[5:0]
PLLCR
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)
(CACMCLK)
1/2
1/4
1/8
1/16
1/32
1/64
IWDT-dedicated
on-chip oscillator
Wait
control
MSTS[4:0]
MOSCWTCR
Sel
e
ct
or
Se
le
ct
o
r
Se
le
ct
o
r