SH7041A datasheet(119/923 Pages) RENESAS

Part #	SH7041A

Description	Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

PDF	923 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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119 / 923 page

Section 4 Clock Pulse Generator (CPG)

4.1

Overview

The SH7040 Series has an on-chip clock pulse generator (CPG) that generates the system clock

(

φ), as well as the internal clock (φ/2 to φ/8192). The CPG consists of an oscillator, a PLL, and a

prescaler.

4.1.1

Block Diagram

A block diagram of the clock pulse generator is shown in figure 4.1.

PLLCAP

EXTAL

XTAL

MD2

MD3

Oscillator

PLL circuit

Clock mode

control circuitry

Prescaler

Within the LSI

φ/2 to

φ/8192

Figure 4.1 Block Diagram of the Clock Pulse Generator

4.2

Oscillator

Clock pulses can be supplied from a connected crystal resonator or an external clock.

4.2.1

Connecting a Crystal Oscillator

Circuit Configuration: A crystal oscillator can be connected as shown in figure 4.2. Use the

damping resistance (Rd) listed in table 4.1. Use a 4–10 MHz crystal oscillator (consult your dealer

concerning the compatibility of the crystal oscillator and the LSI).

SH7041A Datasheet(PDF) 119 Page - Renesas Technology Corp