參數(shù)資料
型號(hào)： UPD780022AY
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位單晶片微控制器
文件頁(yè)數(shù)： 30/90頁(yè)
文件大?。?/td> 660K
代理商： UPD780022AY
μ
PD78F0034B, 78F0034BY, 78F0034B(A), 78F0034BY(A)
30
Data Sheet U16369EJ1V0DS
Main System Clock Oscillator Characteristics (T
A
= –40 to +85
°
C, V
DD
= 1.8 to 5.5 V)
Resonator
Recommended
Circuit
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Ceramic
Oscillation
4.5 V
≤
V
DD
≤
5.5 V
3.0 V
≤
V
DD
<
4.5 V
1.8 V
≤
V
DD
<
3.0 V
After V
DD
reaches
1.0
12.0
MHz
resonator
frequency (f
X
)
Note 1
1.0
8.38
1.0
5.0
Oscillation
4
ms
stabilization time
Note 2
oscillation voltage range
MIN.
4.5 V
≤
V
DD
≤
5.5 V
3.0 V
≤
V
DD
<
4.5 V
1.8 V
≤
V
DD
<
3.0 V
4.0 V
≤
V
DD
≤
5.5 V
1.8 V
≤
V
DD
<
4.0 V
4.5 V
≤
V
DD
≤
5.5 V
3.0 V
≤
V
DD
<
4.5 V
1.8 V
≤
V
DD
<
3.0 V
4.5 V
≤
V
DD
≤
5.5 V
3.0 V
≤
V
DD
<
4.5 V
1.8 V
≤
V
DD
<
3.0 V
Crystal
Oscillation
1.0
12.0
MHz
resonator
frequency (f
X
)
Note 1
1.0
8.38
1.0
5.0
Oscillation
10
ms
stabilization time
Note 2
30
External
X1 input
1.0
12.0
MHz
clock
frequency (f
X
)
Note 1
1.0
8.38
1.0
5.0
X1 input
38
500
ns
high-/low-level width
50
500
(t
XH
, t
XL
)
85
500
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, wire as follows in the area enclosed by the broken
lines in the above figures to avoid an adverse effect from wiring capacitance.
Keep the wiring length as short as possible.
Do not cross the wiring with the other signal lines.
Do not route the wiring near a signal line through which a high fluctuating current flows.
Always make the ground point of the oscillator capacitor the same potential as V
SS1
.
Do not ground the capacitor to a ground pattern through which a high current flows.
Do not fetch signals from the oscillator.
2. When the main system clock is stopped and the system 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.
Remark
For the resonator selection and oscillator constant, customers are required to either evaluate the
oscillation themselves or apply to the resonator manufacturer for evaluation.
X2
X1
C2
C1
X1
X2
V
PP
C2
C1
X1
X2
V
PP
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