HD404612FS datasheet(38/91 Pages) RENESAS

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HD404618 Series

Table 18 Oscillator Circuit Examples

Circuit Configuration

Circuit Constants

External clock operation

(OSC

1, OSC 2)

External

oscillator

OSC

Open

OSC

Ceramic oscillator

(OSC

1, OSC 2)

OSC

Ceramic

GND

Ceramic oscillator: CSB400P22,

CSB400P (Murata)

f = 1 MΩ ± 20%

1 = C2 = 220 pF ± 5%

Ceramic oscillator: CSB800J122,

CSB800J(Murata)

f = 1 MΩ ± 20%

1 = C2 = 220 pF ± 5%

Crystal oscillator

Crystal

GND

C RS

Crystal: 32.768 kHz: MX38T

(Nippon Denpa Kogyo)

s = 14 kΩ

0 = 1.5 pF

1 = 20 pF ± 20%

2 = 20 pF ± 20%

Notes: 1. The circuit constants given above are recommended values provided by the oscillator

manufacturer. Since they may be affected by stray capacitances from the oscillator or board,

consult the crystal or ceramic oscillator manufacturer to determine the actual circuit parameters

required.

2. Wiring between the OSC

1/OSC2 pins (X1, X2 pins) and other elements must be as short as

possible, and must not cross other wiring. Refer to the recommended layout of the crystal and

ceramic oscillator in figure 22.

3. If a 32.768-kHz crystal oscillator is not used, fix the X1 pin to V

CC and leave the X2 pin open.

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