HD404354 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HD404354

4-bit HMCS400-series microcomputer

Hitachi -> Renesas Electronics 

Table 20 Oscillator Circuit Examples

External clock

operation

Circuit Configuration

External

oscillator

OSC 1

HD404358 Series

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.

OSC1

OSC2

CO

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, and elements should be as short as possible, and must not cross

other wiring (see figure 18).

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