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參數(shù)資料
| 型號： | μPD780204 |
| 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位單片機微控制器（8位單片微控制器） |
| 文件頁數(shù)： | 39/78頁 |
| 文件大?。?/td> | 406K |
| 代理商： | ΜPD780204 |
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3 9
m
PD780204, 780205, 780206, 780208
MAIN SYSTEM CLOCK OSCILLATION CIRCUIT CHARACTERISTICS (T
A
= –40 to +85 °C, V
DD
= 2.7 to 5.5 V)
Resonator
Recommended Circuit
Parameter
Conditions
MIN. TYP. MAX. Unit
Oscillator frequency
(f
X
)
Note 1
Oscillator stabilization
time
Note 2
Oscillator frequency
(f
X
)
Note 1
Oscillator stabilization
time
Note 2
V
DD
= 4.5 to 5.5 V
10
30
X1 input frequency
(f
X
)
Note 1
X1 input high-/low-level
width (t
XH
/t
XL
)
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 reset, or STOP mode release.
Cautions 1. When the main system 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. When the main system clock is stopped and the device is operating on the subsystem clock, wait
until the oscillation stabilization time has been secured by the program before switching back
to the main system clock.
1
5
MHz
4
ms
1
4.19
5
MHz
ms
1
5
MHz
85
500
ns
X1
X2
PD74HCU04
μ
X1
IC
X2
C2
C1
Crystal resonator
External clock
Ceramic resonator
X1 X2
IC
C1
C2
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