Rev. 3.0, 10/02, page 595 of 686
Section 21 Clock Pulse Generator
This LSI has an on-chip clock pulse generator that generates the system clock (ø), the bus master
clock, and internal clocks. The clock pulse generator consists of a system clock oscillator, duty
adjustment circuit, medium-speed clock divider, bus master clock selection circuit, USB operating
clock oscillator, PLL (Phase Locked Loop) circuit, and USB operating clock selection circuit. A
block diagram of clock pulse generator is shown in figure 21.1.
EXTAL
XTAL
Duty
adjustment
curcuit
EXTAL
XTAL
System
clock
oscillator
USB
operation
clock
EXTAL
XTAL
EXTAL48
XTAL48
USB
operation
clock
oscillator
Medium-
speed
clock divicler
System clock
to pin
USB operation
clock
to USB
USB clock
USB
Internal clock
to supporting
modules
Bus master clock
To CPU,
DTC,
DMAC,
/2
to /32
SCK2 to SCK0
UCKS3 to UCKS0
SCKCR
RFCUT
48 MHz
LPWRCR
UCTLR
Bus
master
clock
selection
circuit
Legend:
LPWRCR : Low power control register
SCKCR
: System clock control register
UCTLR
: USB control register
PLL curcuit
( 3)
Figure 21.1 Block Diagram of Clock Pulse Generator
The frequency of the system clock oscillator can be changed by software by means of settings in
the low-power control register (LPWRCR) and system clock control register (SCKCR). Either
USB operating clock (48 MHz) oscillator or PLL 48-MHz clock can be selected by software by
means of setting the USB control register (UCTLR). For details, refer to section 15, Universal
Serial Bus (USB).
CPG0600A_000120020100
Содержание H8S/2215 Series
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