UPD78361A Datasheet, PDF (29/88 Pages) NEC – 16/8-BIT SINGLE-CHIP MICROCONTROLLER

µPD78361A, 78362A
Figure 3-3. External Circuit of System Clock Oscillator Circuit
(a) crystal oscillator
µ PD78362A
VSS
X1
(b) external clock
µ PD78362A
X1
X2
Open X2
Cautions 1. Wire the portion enclosed by dotted line in Figure 3-3 as follows to avoid adverse
influences due to wiring capacity when using the system clock oscillation circuit.
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal line. Make sure that the wiring is not close
to lines through which a high alternating current flows.
• Always keep the ground point of the capacitor of the oscillation circuit at the same
potential as VSS. Do not ground the circuit to a ground pattern through which a high
current flows.
• Do not extract signals from the oscillator circuit.
2. To input an external clock, do not connect a load such as wiring capacitance to the X2
pin.
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