µPD17P218

16

SYSTEM CLOCK OSCILLATOR CIRCUIT CHARACTERISTICS (Ta = –40 to +85

°C, VDD = 2.0 to 5.5 V)

Recommended

Constants

Oscillation frequency

(fx)

Note 1

1.0

4.0

8.0

MHz

Oscillation

stabilization

4ms

time

Note 2

Oscillation frequency

(fx)

Note 1

1.0

4.0

8.0

MHz

Oscillation

VDD = 4.5 to 5.5 V

10

ms

stabilization

time

Note 2

30

ms

Note 1: The oscillation frequency indicates only the characteristics of the oscillation circuit.

2: The oscillation stabilization time is the time required for oscillation to stabilize after VDD has been

applied or the STOP mode has been released.

Caution:

Wire the shaded portion in the above figures as follows to prevent adverse influence of wiring

capacitance when the system clock oscillation circuit is used:

•

Keep the wiring length as short as possible.

• Do not cross the wiring with the other signal lines. Do not place the wiring in the vicinity of lines

through which a high alternating current flows.

• Always keep the ground of the capacitor of the oscillation circuit at the same potential as GND. Do

not ground the capacitor to a ground pattern through which a high current flows.

• Do not extract a signal from the oscillation circuit.

Ceramic

Oscillator

Crystal

Oscillator

After VDD has

reached MIN value

of oscillation

voltage range

Oscillator

Item

Conditions

MIN.

TYP.

MAX.

Unit

5

X IN

X OUT

X IN

X OUT