HD404458 datasheet(45/122 Pages) RENESAS

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HD404459 Series

Table 22

Oscillator Circuit Examples

Circuit Configuration

Circuit Constants

External clock

operation

External

oscillator

OSC

Open

OSC

Ceramic oscillator

(OSC

1, OSC 2)

OSC

Ceramic

GND

Ceramic oscillator: CSA4.00MG (Murata)

f = 1 MΩ ± 20%

1 = C2 = 30 pF

Crystal oscillator

(OSC

1, OSC 2)

Crystal

GND

OSC1

OSC2

OSC1

f = 1 MΩ ± 20%

1 = C2 = 10–22 pF ± 20%

Crystal: Equivalent to circuit shown below

7 pF max.

100

Ω max.

Crystal oscillator

(X1, X2)

Crystal

GND

Crystal: 32.768 kHz: MX38T

(Nippon Denpa Kogyo)

1 = C2 = 15 pF ± 5%

14 k

Ω

1.5 pF

Notes: 1. Since the circuit constants change depending on the crystal or ceramic resonator and stray

capacitance of the board, the user should consult with the crystal or ceramic oscillator

manufacturer to determine the circuit parameters.

2. Wiring among OSC

1, OSC 2, X1, X2, and elements should be as short as possible, and must not

cross other wiring (figure 28).

3. If the 32.768-kHz crystal oscillator is not used, the X1 pin must be fixed to GND and X2 must be

open.

HD404458 Datasheet(PDF) 45 Page - Renesas Technology Corp

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