UPD78323LP datasheet(35/88 Pages) RENESAS

номер детали	UPD78323LP

подробное описание детали	MOS INTEGRATED CIRCUIT

PDF	88 Pages

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производитель	RENESAS [Renesas Technology Corp]

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35 / 88 page

µPD78323, 78324

Figure 3-2. Externally-Mounted System Clock Generator

(a) Crystal oscillator

Cautions 1. When the system clock oscillator is used, the following points should be noted concerning wiring

within broken lines shown in Figure 3-2, in order to prevent the effects of wiring capacitance, etc.

•

Keep the wiring as short as possible.

•

Do not cross any other signal lines, and keep clear of lines in which a high fluctuating current

flows.

•

Ensure that oscillator capacitor connection points are always at the same potential as VSS. Do not

ground in a ground pattern in which a high current flows.

•

Do not take a signal from the oscillator.

2. When an external clock is input to the X1 pin and the X2 pin is left open, ensure that no loads such

as wiring capacitance are connected to the X2 pin.

(b) External clock

(i) When the inverted phase of an

external clock to be input to the

X1 pin is input to the X2 pin

(ii) When X2 pin is left open

VSS

PD78324

External

Clock

PD78324

Open

External

Clock

PD78324

UPD78323LP датащи(PDF) 35 Page - Renesas Technology Corp