RX610 Group
7. Clock Generation Circuit
R01UH0032EJ0120 Rev.1.20
Page 160 of 1006
Feb 20, 2013
7.
Clock Generation Circuit
7.1
Overview
The RX610 Group has a clock generation circuit that generates the system clock (ICLK), peripheral module clock (PCLK),
and external bus clock (BCLK).
The clock generation circuit consists of a main clock oscillator, phase-locked loop (PLL) circuit, frequency divider, and
selector circuit.
Table 7.1 lists the specifications of the clock generation circuit. Figure 7.1 shows a block diagram of the clock generation
circuit.
Table 7.1 Specifications of Clock Generation Circuit
Item
Specification
Use
•
Generates the system clock (ICLK) to be supplied to the CPU, DTC, DMAC,
ROM, and RAM.
•
Generates the peripheral module clock (PCLK) to be supplied to peripheral
modules.
•
Generates the external bus clock (BCLK) to be supplied to the external bus.
Input clock (EXTAL) frequency
8 to 14 MHz
Selection of ICLK, PCLK, or BCLK
The ICLK, PCLK, or BCLK is selectable independently from EXTAL ×8, ×4,
×2, and ×1.
Operating frequency
ICLK: 8 to 100 MHz
PCLK: 8 to 50 MHz
BCLK: 8 to 25 MHz
Restrictions for setting clock frequencies: ICLK
≥
PCLK and ICLK
≥
BCLK
Connectable resonator or additional
circuit
Crystal resonator
Pins for connection to the resonator or
additional circuit
EXTAL and XTAL
BCLK output control function
BCLK output or high-level output is selectable.
EXTAL
XTAL
Frequency
divider
SCKCR
PCK[3:0]
ICK[3:0]
EXTAL
×
8
×
4
System clock (ICLK)
To CPU, DTC, DMAC, ROM, and RAM
Peripheral module clock (PCLK)
To peripheral module
Selector
BCK[3:0]
External bus clock (BCLK)
To BCLK pin and external bus controller
SCKCR
SCKCR
Selector
Selector
PLL circuit
Main clock
oscillator
×
2
×
1
Figure 7.1 Block Diagram of Clock Generation Circuit
Summary of Contents for RX600 Series
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