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參數(shù)資料
| 型號： | μPD78P0208 |
| 廠商： | NEC Corp. |
| 英文描述： | 8 Bit Single Chip Microcontrollers(8位單片微控制器) |
| 中文描述： | 8位單片機(jī)微控制器（8位單片微控制器） |
| 文件頁數(shù)： | 35/72頁 |
| 文件大?。?/td> | 424K |
| 代理商： | ΜPD78P0208 |
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35
m
PD78P0208
Notes 1.
Only the oscillator characteristics are shown. See
AC characteristics
for instruction execution times.
2.
This is the time required for oscillation to stabilize after power (V
DD
) is turned on.
Cautions 1. When the subsystem clock oscillator is used, the following should be noted concerning wiring
in the area in the figure enclosed by a broken line to prevent the influence of wiring capacitance,
etc.
The wiring should be kept as short as possible.
No other signal lines should be crossed.
Keep away from lines carrying a high fluctuating current.
The oscillator capacitor grounding point should always be at the same potential as V
SS
.
Do not connect to a ground pattern carrying a high current.
A signal should not be taken from the oscillator.
2. The subsystem clock oscillator is a low-amplitude circuit in order to achieve a low consumption
current, and is more prone to misoperation due to noise than the main system clock oscillator.
Particular care is therefore required with the wiring method when the subsystem clock is used.
SUBSYSTEM CLOCK OSCILLATOR CHARACTERISTICS (T
A
= –40 to +85 °C, V
DD
= 2.7 to 5.5 V)
Crystal resonator
External clock
XT1
V
PP
XT2
C4
R
C3
V
DD
= 4.5 to 5.5 V
XT1
XT2
Oscillator frequency
(f
XT
)
Note 1
Oscillation settling
time
Note 2
XT1 input frequency
(f
XT
)
Note 1
XT1 input high-/low-
level width (t
XTH
/t
XTL
)
kHz
s
kHz
m
s
Resonator
Recommended circuit
Parameter
Conditions
Min.
Typ.
Max.
Unit
32
32
5
35
2
10
100
15
32.768
1.2
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