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UPD78P328 Datasheet(PDF) 21 Page - NEC

Part # UPD78P328
Description  16/8-BIT SINGLE-CHIP MICROCONTROLLER
PDF  48 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD78P328 Datasheet(HTML) 21 Page - NEC

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µPD78P328
21
Resonator
Recommended Circuit
Parameter
MIN.
MAX.
Unit
Ceramic or crystal
Oscillation frequency (fXX)
8
16
MHz
resonator
External clock
X1 input frequency (fX)
8
16
MHz
X1 input rise, fall time (fXR, tXF)
0
20
ns
X1 input high, low level width
25
80
ns
(tWXH, tWXL)
Oscillator Characteristics (TA = –10 to +70
°C, VDD = +5 V±5%, VSS = 0 V)
Caution When using the system clock oscillator, wire the portion enclosed in dotted line in the figure as
follows to avoid adverse influences on the wiring capacitance:
• Keep the wiring length as short as possible.
• Do not cross the wiring over the other signal lines. Do not route the wiring in the vicinity of
lines through which a high fluctuating current flows.
• Always keep the ground point of the capacitor of the oscillator circuit at the same potential as
VSS. Do not connect the power source pattern through which a high current flows.
• Do not extract signals from the oscillation circuit.
Recommended Oscillator Constants
Ceramic resonator
Manufacturer Name
Part Number
Frequency
Recommended
[MHz]
Constants
C1 [pF]
C2 [pF]
MURATA
CSA8.00MT
8.0
30
30
CSA12.0MT
12.0
CSA16.00MX040
16.0
15
15
CST8.00MTW
8.0
Internal
Internal
CST12.00MTW
12.0
CST16.00MXW0C3
16.0
X1
X2
C1
C2
VSS
X1
X2
HCMOS
Inverter
X1
X2
HCMOS
Inverter
Open
or



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