hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 102

• Manufacturer Part Number: hd66100
• Description: H8/3867 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 ø and ø
of the clock signals have names: ø is the system clock, ø
clock, and ø
The clock signals available for use by peripheral modules are ø/2, ø/4, ø/8, ø/16, ø/32, ø/64, ø/128,
ø/256, ø/512, ø/1024, ø/2048, ø/4096, ø/8192, ø
ø
OSC
OSC
W
X
X
/128. The clock requirements differ from one module to another.
1
2
1
2
Overview
Block Diagram
System Clock and Subclock
System clock pulse generator
Subclock pulse generator
System clock
Subclock
oscillator
W
oscillator
is the watch clock.
Figure 4.1 Block Diagram of Clock Pulse Generators
Section 4 Clock Pulse Generators
ø
(f
(f )
ø
W
OSC
W
OSC
)
System clock
(1/2, 1/4, 1/8)
divider (1/2)
Subclock
divider
ø
ø /2
ø /4
ø /8
OSC
W
W
W
W
/2
System
divider
, ø
clock
W
/2, ø
SUB
W
ø
ø
ø
ø
is the subclock, ø
/4, ø
OSC
OSC
OSC
OSC
/128
/64
/32
/16
W
/8, ø
W
/16, ø
Prescaler W
Prescaler S
(13 bits)
ø
ø
(5 bits)
OSC
SUB
W
/32, ø
is the oscillator
SUB
W
/64, and
. Four
ø/2
to
ø/8192
ø
ø /2
ø /4
ø /8
to
ø /128
W
W
W
W
W
87