HD4043312 查看數據表（PDF） - Hitachi -> Renesas Electronics

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HD4043312

4-bit HMCS400-Series microcomputer

Hitachi -> Renesas Electronics 

HD404339 Series

Table 4 Oscillator Circuit Examples

External clock

operation

Circuit Configuration

External

oscillator

OSC 1

Circuit Constants

Open

OSC2

Ceramic oscillator

(OSC1, OSC2)

Crystal oscillator

(OSC1, OSC2)

C1

Ceramic

C2

GND

OSC1

Rf

OSC2

C1

Crystal

C2

GND

OSC1

Rf

OSC2

L CS RS

Ceramic oscillator: CSA4.00MG

(Murata)

Rf = 1 MΩ ±20%

C1 = C2 = 30 pF ±20%

Rf = 1 MΩ ±20%

C1 = C2 = 10 to 22 pF ±20%

Crystal: Equivalent to circuit shown below

C0 = 7 pF max.

RS = 100 Ω max.

Crystal oscillator

(X1, X2)

OSC1

C1

Crystal

C0

X1

C2

GND

X2

L CS RS

OSC2

Crystal: 32.768 kHz: MX38T (Nippon

Denpa)

C1 = C2 = 20 pF ±20%

RS = 14 kΩ

C0 = 1.5 pF

X1

X2

C0

Notes: 1. Since the circuit constants change depending on the crystal or ceramic oscillator 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 OSC1, OSC2, X1, X2 and elements should be as short as possible, and must not

cross other wiring (see figure 19).

3. When a 32.768-kHz crystal oscillator is not used, fix pin X1 to GND and leave pin X2 open.

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