HD6473847RHV Datasheet, PDF (125/546 Pages) Renesas Technology Corp – Renesas 8-Bit Single-Chip Microcomputer H8 Family / H8/300L Super Low Power Series

Section 4 Clock Pulse Generators
Section 4 Clock Pulse Generators
4.1 Features
Clock oscillator circuitry (CPG: clock pulse generator) is provided on-chip, including both a
system clock pulse generator and a subclock pulse generator. In the H8/38104 Group, the system
clock pulse generator includes an on-chip oscillator. The system clock pulse generator consists of
a system clock oscillator and system clock dividers. The subclock pulse generator consists of a
subclock oscillator and a subclock divider.
Figure 4.1 shows a block diagram of the clock pulse generators of the H8/3802, H8/38004 and
H8/38002S Group. Figure 4.2 shows a block diagram of the clock pulse generators of the
H8/38104 Group.
OSC1
OSC2
X1
X2
System
clock
oscillator
φOSC
(fOSC)
System
clock
divider (1/2)
System clock pulse generator
φOSC/2
System
clock
divider
φOSC/16
φOSC/32
φOSC/64
φOSC/128
Subclock
φW
oscillator
(fW)
Subclock
divider
(1/2, 1/4, 1/8)
φW/2
φW/4
φW/8
Subclock pulse generator
φ
Prescaler S
(13 bits)
φ/2
to
φ/8192
φW
φSUB
Prescaler W
(5 bits)
φW/2
φW/4
φW/8
to
φW/128
Figure 4.1 Block Diagram of Clock Pulse Generators
(H8/3802, H8/38004, H8/38002S Group)
CPG0201A_000020020900
Rev. 7.00 Mar. 08, 2010 Page 93 of 510
REJ09B0024-0700