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參數(shù)資料
| 型號： | UPD754264GS |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | 4位單晶片微控制器 |
| 文件頁數(shù)： | 46/68頁 |
| 文件大小： | 318K |
| 代理商： | UPD754264GS |
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46
μ
PD754264
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
)
Note1
1.0
6.0
Notes2, 3, 4
MHz
Oscillation
stabilization
time
Note 5
After V
DD
reaches MIN.
value of oscillation
voltage range
4
ms
Crystal
resonator
Oscillation
frequency(f
X
)
Note1
1.0
6.0
Notes2, 3, 4
MHz
Oscillation
stabilization time
Note3
V
DD
= 4.5 to 6.0 V
10
ms
30
ms
External
clock
X1 input
frequency (f
X
)
Note1
1.0
6.0
Notes2, 3, 4
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 Character-
istics
.
2.
If the oscillation frequency is 2.1 MHz < f
X
≤
4.19 MHz at 1.8 V
≤
V
DD
< 2.0 V, set the processor control register
(PCC) to a value other than 0011. If the PCC is set to 0011, the rated machine cycle time of 1.9
μ
s is not
satisfied.
3.
If the oscillation frequency is 4.19 MHz < f
X
≤
6.0 MHz at 1.8 V
≤
V
DD
< 2.0 V, set the processor control register
(PCC) to a value other than 0011 or 0010. If the PCC is set to 0011 or 0010, the rated machine cycle time
of 1.9
μ
s is not satisfied.
4.
If the oscillation frequency is 4.19 MHz < f
X
≤
6.0 MHz at 2.0 V
≤
V
DD
< 2.7 V, set the processor control register
(PCC) to a value other than 0011. If the PCC is set to 0011, the rated machine cycle time of 0.95
μ
s is not
satisfied.
5.
Oscillation stabilization time is a time required for oscillation to stabilize after application of V
DD
,
or after the STOP mode has been released.
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.
X1
X2
C1
C2
X1
X2
C1
C2
X1
X2
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