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參數(shù)資料
| 型號： | μPD78074B |
| 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)： | 40/76頁 |
| 文件大?。?/td> | 568K |
| 代理商： | ΜPD78074B |
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40
μ
PD78074B, 78075B
Resonator
Recommended
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Circuit
Ceramic
resonator
Oscillation
frequency (f
X
)
Note 1
V
DD
= Oscillation voltage
range
1.0
5.0
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
1.0
5.0
MHz
Oscillation
stabilization time
Note 2
V
DD
= 4.5 to 5.5 V
10
ms
30
External
clock
X1 input
frequency (f
X
)
Note 1
1.0
5.0
MHz
X1 input
high/low-level width
(t
XH
, t
XL
)
85
500
ns
IC X2
X1
C2
C1
R1
MAIN SYSTEM CLOCK OSCILLATION CIRCUIT CHARACTERISTICS (T
A
= –40 to +85
°
C, V
DD
= 1.8 to 5.5 V)
Notes 1.
Indicates only oscillation circuit 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 oscillation circuit, wiring in the area enclosed with the
broken 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 oscillation circuit capacitor ground should always be the same as that
of V
SS
.
Do not ground wiring to a ground pattern in which a high current flows.
Do not fetch a signal from the oscillation circuit.
2.
When the main system clock is stopped and the system is operated by the subsystem clock,
the subsystem clock should be switched again to the main system clock after the oscillation
stabilization time is secured by the program.
IC X2
X1
C2
C1
X2
X1
PD74HCU04
μ
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