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參數(shù)資料
| 型號： | μPD78P048A |
| 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)： | 33/72頁 |
| 文件大?。?/td> | 387K |
| 代理商： | ΜPD78P048A |
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m
PD78P048A
33
X1
X2
PD74HCU04
μ
X1
V
SS
X2
C2
C1
Main System Clock Oscillation Circuit Characteristics (T
A
= –40 to +85 °C, V
DD
= 2.7 to 6.0 V)
Resonator
Recommended Circuit
Parameter
Conditions
MIN. TYP. MAX. Unit
Ceramic resonator
Oscillator frequency
(f
X
)
Note 1
1
5
MHz
Oscillator stabilization
time
Note 2
4
ms
Crystal resonator
Oscillator frequency
(f
X
)
Note 1
1
4.19
5
MHz
Oscillator stabilization
time
Note 2
V
DD
= 4.5 to 6.0 V
10
ms
30
External clock
X1 input frequency
(f
X
)
Note 1
1
5
MHz
X1 input high-/low-level
width (t
XH
/t
XL
)
85
500
ns
Notes 1.
Only the oscillator characteristics are shown. Refer to
AC characteristics
for instruction execution times.
2.
This is the time required for oscillation to stabilize after addition of V
DD
, 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.
X1 X2
V
SS
C1
C2
R1
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