H838024 datasheet(145/697 Pages) RENESAS

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Section 4 Clock Pulse Generators

Rev. 7.00 Mar 10, 2005 page 103 of 652

REJ09B0042-0700

Section 4 Clock Pulse Generators

4.1

Overview

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.

In the H8/38124 Group, the system clock pulse generator includes an on-chip oscillator.

4.1.1

Block Diagram

Figure 4.1 shows a block diagram of the clock pulse generators of the H8/38024, H8/38024S, and

H8/38024R Group. Figure 4.2 shows a block diagram of the clock pulse generators of the

H8/38124 Group.

System clock

oscillator

System clock

divider (1/2)

Subclock

oscillator

Subclock

divider

(1/2, 1/4, 1/8)

System

clock

divider

System clock pulse generator

Subclock pulse generator

Prescaler S

(13 bits)

Prescaler W

(5 bits)

OSC

(

fOSC)

(

fW)

OSC/2

W /2

W /8

φSUB

φ/2

φ/8192

W /2

W /4

W /8

W /128

OSC/128

OSC/64

OSC/32

OSC/16

W /4

Figure 4.1(1) Block Diagram of Clock Pulse Generators

(H8/38024 Group, H8/38024S Group, H8/38024R Group)

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