UPD78F9418AGK-9EU Renesas Electronics America, UPD78F9418AGK-9EU Datasheet - Page 96

• Manufacturer Part Number: UPD78F9418AGK-9EU
• Manufacturer: Renesas Electronics America

Specifications of UPD78F9418AGK-9EU

• Lead Free Status / Rohs Status: Supplier Unconfirmed

5.4 System Clock Oscillators
5.4.1 Main system clock oscillator
the X1 and X2 pins.
inverted signal to the X2 pin.
94
Caution
The main system clock oscillator is oscillated by a crystal or ceramic resonator (5.0 MHz TYP.) connected across
An external clock can also be input to the circuit. In this case, input the clock signal to the X1 pin, and input the
Figure 5-5 shows the external circuit of the main system clock oscillator.
(a) Crystal or ceramic oscillation
When using the main system or subsystem clock oscillator, wire as follows in the area enclosed
by the broken lines in Figures 5-5 and 5-6 to avoid an adverse effect from wiring capacitance.
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.
Always make the ground point of the oscillator capacitor the same potential as V
Do not ground the capacitor to a ground pattern through which a high current flows.
Do not fetch signals from the oscillator.
Crystal
or
ceramic resonator
Figure 5-5. External Circuit of Main System Clock Oscillator
V
X1
X2
SS0
, V
SS 1
CHAPTER 5 CLOCK GENERATOR
User’s Manual U13952EJ3V1UD
External
clock
(b) External clock
X1
X2
SS0
and V
SS1
.