UPD78323 NEC, UPD78323 Datasheet - Page 64

• Manufacturer Part Number: UPD78323
• Description: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
• Manufacturer: NEC

64
OSCILLATOR CHARACTERISTICS (T
Caution
Ceramic resonator
or
crystal resonator
External clock
Resonator
When using the system clock oscillation circuit, wire the part encircled in the dotted line in the following
manner to avoid the influence of the wiring capacity, etc.
• Make the wiring as short as possible.
• Avoid intersecting other signal conductors. Avoid approaching lines in which very high fluctuating
• Make sure that the grounding point of the oscillation circuit capacitor always has the same electrical
• Do not fetch signals from the oscillation circuit.
currents run.
potential as V
Recommended Circuit
X2
SS
. Avoid grounding with a grand pattern in which very high currents run.
C2
X1
X1
HCMOS
Invertor
HCMOS
Invertor
or
X1
A
= –10 to +70 C, V
C1
Open
X2
X2
V
SS
Oscillation frequency (f
X1 input frequency (f
X1 input rise/fall time (t
X1 input high/low level width
(t
WXH
DD
, t
= +5 V 10 %, V
WXL
)
Parameter
X
)
XX
XR
)
, t
SS
XF
= 0 V)
)
MIN.
25
8
8
0
PD78323, 78324
MAX.
16
16
20
80
MHz
MHz
Unit
ns
ns