參數(shù)資料
型號(hào)： μPD754202(A)
廠商： NEC Corp.
英文描述： 4 Bit Single Chip Microcontrollers(4位單片微控制器)
中文描述： 4位單片微控制器（4位單片微控制器）
文件頁數(shù)： 45/66頁
文件大?。?/td> 339K
代理商： ΜPD754202(A)
45
m
PD754202, 754202(A)
X1
X2
X1
X2
C1
C2
X1
X2
C1
C2
System Clock Oscillator Characteristics (T
A
= –40 to +85 °C, V
DD
= 1.8 to 6.0 V)
Resonator
Recommended Constant
Parameter
Testing Conditions
MIN.
TYP.
MAX.
Unit
Ceramic
resonator
Oscillation
frequency (f
X
)
Note 1
1.0
6.0
Note 2
MHz
Oscillation
stabilization
time
Note 3
After V
DD
reaches MIN.
value of oscillation
voltage range
4
ms
Crystal
resonator
Oscillation
frequency(f
X
)
Note 1
1.0
6.0
Note 2
MHz
Oscillation
stabilization time
Note 3
V
DD
= 4.5 to 6.0 V
10
ms
30
ms
External
clock
X1 input
frequency (f
X
)
Note 1
1.0
6.0
Note 2
MHz
X1 input high- and
low-level widths
(t
XH
, t
XL
)
83.3
500
ns
Notes 1.
Only the oscillator characteristics are shown. For the instruction execution time, refer to
AC Charac-
teristics
.
If the oscillation frequency is 4.19 MHz < f
X
- 6.0 MHz at 1.8 V - V
DD
< 2.7 V, set the processor clock
control register (PCC) to a value other than 0011. If the PCC is set to 0011, the rated machine cycle
time of 0.95
m
s is not satisfied.
The oscillation stabilization time is the time required for oscillation to stabilize after application of V
DD
,
or after the STOP mode has been released.
2.
3.
Caution When using the oscillation circuit of the system clock, wire the portion enclosed in dotted lines
in the figures as follows to avoid adverse influences on the wiring capacitance:
Keep the wire length as short as possible.
Do not cross other signal lines.
Do not route the wiring in the vicinity of lines though which a high fluctuating current flows.
Always keep the ground point of the capacitor of the oscillation circuit as the same potential
as V
SS
.
Do not connect the power source pattern through which a high current flows.
Do not extract signals from the oscillation circuit.
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