M16CSLASH26 datasheet(35/239 Pages) RENESAS

35 / 239 page

Clock Generating Circuit

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Microcomputer

(Built-in feedback resistor)

XIN

XOUT

Externally derived clock

Open

Vcc

Vss

Microcomputer

(Built-in feedback resistor)

XIN

XOUT

CIN

COUT

(Note)

Note: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive

capacity setting. Use the value recommended by the maker of the oscillator.

When the oscillation drive capacity is set to low, check that oscillation is stable. Also, if the oscillator manufacturer's

data sheet specifies that a feedback resistor be added external to the chip, insert a feedback resistor between XIN

and XOUT following the instruction.

Microcomputer

(Built-in feedback resistor)

XCIN

XCOUT

Externally derived clock

Open

Vcc

Vss

Note: Insert a damping resistor if required. The resistance will vary depending on the oscillator and the oscillation drive

capacity setting. Use the value recommended by the maker of the oscillator.

Also, if the oscillator manufacturer's data sheet specifies that a feedback resistor be added external to the chip,

insert a feedback resistor between XCIN and XCOUT following the instruction.

Microcomputer

(Built-in feedback resistor)

XCIN

XCOUT

(Note)

CCIN

CCOUT

RCd

Figure 1.8.2. Examples of sub-clock

Figure 1.8.1. Examples of main clock

Figure 1.8.1 shows some examples of the main clock circuit, one using an oscillator connected to the

circuit, and the other one using an externally derived clock for input. Figure 1.8.2 shows some examples of

sub-clock circuits, one using an oscillator connected to the circuit, and the other one using an externally

derived clock for input. Circuit constants in Figures 1.8.1 and 1.8.2 vary with each oscillator used. Use the

values recommended by the manufacturer of your oscillator.

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