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參數(shù)資料
| 型號： | μPD780208 |
| 廠商： | NEC Corp. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8 Bit Single Chip Microcontrollers |
| 中文描述： | 8位單片機(jī)微控制器 |
| 文件頁數(shù)： | 40/78頁 |
| 文件大小： | 406K |
| 代理商： | ΜPD780208 |
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4 0
m
PD780204, 780205, 780206, 780208
SUBSYSTEM CLOCK OSCILLATOR CHARACTERISTICS (T
A
= –40 to +85 °C, V
DD
= 2.7 to 5.5 V)
XT1
XT2
XT1
IC
XT2
C4
R
C3
External clock
Crystal resonator
Resonator
Recommended Circuit
Parameter
Conditions
MIN.
TYP. MAX. Unit
Oscillator frequency
(f
XT
)
Note 1
Oscillator stabilization
time
Note 2
XT1 input frequency
(f
XT
)
Note 1
XT1 input high-/low-level
width (t
XTH
/t
XTL
)
32.768
32
kHz
35
V
DD
= 4.5 to 5.5 V
10
s
32
100
kHz
5
15
m
s
1.2
2
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 V
DD
reaches MIN. in the range of oscillation voltage.
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.
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