MC-78F0712-KIT Renesas Electronics America, MC-78F0712-KIT Datasheet - Page 85

• Manufacturer Part Number: MC-78F0712-KIT
• Description: KIT REF SYSTEM 78K0 UPD78F0712
• Manufacturer: Renesas Electronics America

Specifications of MC-78F0712-KIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.4
5.4.1
and X2 pins. Oscillation can be controlled by the main OSC control register (MOC).
inverse signal to the X2 pin.
The X1 oscillator oscillates with a crystal resonator or ceramic resonator (Standard: 20 MHz) connected to the X1
An external clock can be input to the X1 oscillator. In this case, input the clock signal to the X1 pin and input the
Figure 5-9 shows examples of the external circuit of the X1 oscillator.
Caution When using the X1 oscillator, wire as follows in the area enclosed by the broken lines in the
System Clock Oscillator
X1 oscillator
Figure 5-9. Examples of External Circuit of X1 Oscillator (crystal, ceramic oscillation)
Figure 5-9 to avoid an adverse effect from wiring capacitance.
•
•
•
•
•
(a) Crystal, ceramic oscillation
Always make the ground point of the oscillator capacitor the same potential as V
ground the capacitor to a ground pattern through which a high current flows.
Keep the wiring length as short as possible.
Do not cross the wiring with the other signal lines.
Do not route the wiring near a signal line through which a high fluctuating current flows.
Do not fetch signals from the oscillator.
Crystal resonator or
ceramic resonator
V
X1
X2
SS
CHAPTER 5 CLOCK GENERATOR
User’s Manual U17890EJ2V0UD
External
clock
(b) External clock
X1
X2
SS
. Do not
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