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| 型號(hào)： | μPD78064B(A) |
| 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(yè)數(shù)： | 37/66頁(yè) |
| 文件大小： | 395K |
| 代理商： | ΜPD78064B(A) |
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37
μ
PD78064B(A)
MAIN SYSTEM CLOCK OSCILLATOR CHARACTERISTICS (T
A
= –40 to +85
°
C, V
DD
= 2.0 to 6.0 V)
Resonator
Recommended circuit
Parameter
Test conditions
MIN.
TYP.
MAX.
Unit
Ceramic
resonator
Oscillation
frequency (f
X
)
Note 1
V
DD
= Oscillation
voltage range
1
5
MHz
Oscillation
stabilization time
Note 2
After V
DD
reaches oscil-
lation voltage range MIN.
4
ms
Crystal
resonator
Oscillation
frequency (f
X
)
Note 1
1
5
MHz
Oscillation
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.
Indicates only oscillator characteristics. Refer to “AC Characteristics” for instruction execution time.
2.
Time required to stabilize oscillation after reset or STOP mode release.
Cautions 1. When using the main system clock oscillator, wiring in the area enclosed with the dotted line
should be carried out as follows to avoid an adverse effect from wiring capacitance.
Wiring should be as short as possible.
Wiring should not cross other signal lines.
Wiring should not be placed close to a varying high current.
The potential of the oscillator capacitor ground should be the same as V
SS
.
Do not ground it to the ground pattern in which a high current flows.
Do not fetch a signal from the oscillator.
2. If the main system clock oscillator is operated by the subsystem clock when the main system
clock is stopped, reswitching to the main system clock should be performed after the oscillation
stabilization time has been obtained by the program.
R1
X1
X2
IC
C1
C2
X1
X2
IC
C1
C2
R1
X1
X2
PD74HCU04
μ
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