6V7 datasheet(37/298 Pages) RENESAS

37 / 298 page

Rev.1.00

May 18, 2004

page 37 of 296

M306V7MG/MH/MJ/MJA-XXXFP, M306V7FG/FH/FJ/FJAFP

Figure 2.5.2 Examples of sub-clock

2.5.1 Example of Oscillator Circuit

Figure 2.5.1 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 2.5.2 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 2.5.1 and 2.5.2 vary with each oscillator used. Use

the values recommended by the manufacturer of your oscillator.

Figure 2.5.1 Examples of main clock

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. When being specified to connect a

feedback resistor externally by the manufacture, connect a feedback resistor between pins XIN and XOUT.

Microcomputer

(Built-in feedback resistor)

XCIN

XCOUT

Externally derived clock

Open

Vcc

Vss

Note 1. Insert a damping resistor if required. The resistance will vary depending on the oscillator. Use the value

recommended by the maker of the oscillator.

When being specified to connect a feedback resistor externally by the manufacture, connect a feedback resistor

between pins XCIN and XCOUT.

Microcomputer

(Built-in feedback resistor)

XCIN

XCOUT

(Note)

CCIN

CCOUT

RCd

2. Since the waveform and amplitude of sub clock tend to be influenced of substrate capacity etc.

Surely, request the oscillation characteristic investigation by the real board from oscillation maker, and use the

oscillation circuit constant recommended.

6V7 Datasheet(PDF) 37 Page - Renesas Technology Corp

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