參數(shù)資料
型號(hào)： μPD78F4216
廠商： NEC Corp.
英文描述： 8/16 Bit RISC Microcontrollers(8/16位RISC微控制器)
中文描述： 8 / 16位RISC微控制器（8 / 16位的RISC微控制器）
文件頁(yè)數(shù)： 23/52頁(yè)
文件大?。?/td> 384K
代理商： ΜPD78F4216
23
μ
PD78F4216
Preliminary Data Sheet
Main System Clock Oscillation Circuit Characteristics (T
A
= –10 to +60
°
C)
Resonator
Recommended Circuit
Item
Test Conditions
MIN.
TYP.
MAX.
Unit
Ceramic or
crystal resonator
Oscillation
frequency (f
X
)
4.5 V
≤
V
DD
≤
5.5 V
2
12.5
MHz
2.7 V
≤
V
DD
< 4.5 V
2
6.25
External clock
X1 input
frequency (f
X
)
4.5 V
≤
V
DD
≤
5.5 V
2
25
MHz
2.7 V
≤
V
DD
< 4.5 V
2
12.5
X1 high-/low-level
width (t
WXH
, t
WXL
)
35
250
ns
X1 input rise,
fall time (t
XR
, t
XF
)
4.5 V
≤
V
DD
≤
5.5 V
0
5
ns
2.7 V
≤
V
DD
< 4.5 V
0
10
Caution When using a main system clock oscillation circuit, wire the portion enclosed by the dotted line
in the diagram above as follows to prevent adverse influence from wiring capacitance:
Keep the wiring length as short as possible.
Do not cross the wiring with any other signal lines.
Do not route the wiring in the vicinity of a line through which a high alternating current flows.
Always keep the ground potential for the capacitor in the oscillation circuit at the same potential
as V
SS
.
Do not ground the capacitor to a ground pattern through which a high current flows.
Do not extract any signal from the oscillation circuit.
X2
X1 V
SS
X2
X1
PD74HCU04
μ
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