參數(shù)資料
型號: μPD78P054
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位單片機微控制器
文件頁數(shù): 32/86頁
文件大?。?/td> 502K
代理商: ΜPD78P054
32
μ
PD78P054, 78P058
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
1.0
5.0
MHz
Oscillation stabilization
time
Note 2
After V
DD
has reached MIN.
of oscillation voltage range
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 6.0 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
Notes 1.
Only the oscillator characteristics are shown. See the AC characteristics for instruction execution times.
2.
This is the time required for oscillation to stabilize after a 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 broken lines 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
V
PP
X2
C2
C1
X1
V
PP
X2
C2
C1
X2
X1
PD74HCU04
μ
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