hd64338342hw Renesas Electronics Corporation., hd64338342hw Datasheet - Page 155

• Manufacturer Part Number: hd64338342hw
• Description: Renesas 8-bit Single-chip Microcomputer H8 Family/h8/300l Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

4.1
Clock oscillator circuitry (CPG: clock pulse generator) is provided on-chip, including both a
system clock pulse generator and a subclock pulse generator. The system clock pulse generator
consists of a system clock oscillator and system clock dividers. The subclock pulse generator
consists of a subclock oscillator circuit and a subclock divider.
4.1.1
Figure 4.1 shows a block diagram of the clock pulse generators.
4.1.2
The basic clock signals that drive the CPU and on-chip peripheral modules are and
of the clock signals have names: is the system clock,
clock, and
The clock signals available for use by peripheral modules are /2, /4, /8, /16, /32, /64,
and
/128, /256, /512, /1024, /2048, /4096, /8192,
EXCL*
OSC
OSC
Note: * H8/38347 Group and H8/38447 Group only.
W
X
X
/128. The clock requirements differ from one module to another.
1
2
1
2
Block Diagram
Overview
System Clock and Subclock
W
System clock pulse generator
Subclock pulse generator
System clock
is the watch clock.
Subclock
oscillator
oscillator
Figure 4.1 Block Diagram of Clock Pulse Generators
Section 4 Clock Pulse Generators
(f
(f )
W
OSC
W
OSC
)
System clock
(1/2, 1/4, 1/8)
divider (1/2)
Subclock
divider
OSC
W
W
W
/4
/2
/8
/2
System
divider
clock
W
SUB
,
Rev. 6.00 Aug 04, 2006 page 119 of 680
W
is the subclock,
/2,
OSC
OSC
OSC
OSC
Section 4 Clock Pulse Generators
/128
/64
/32
/16
W
/4,
W
/8,
Prescaler W
Prescaler S
(13 bits)
(5 bits)
W
OSC
SUB
/16,
REJ09B0145-0600
is the oscillator
W
/32,
SUB
. Four
to
to
/2
/8192
W
W
W
W
W
W
/2
/4
/8
/128
/64,