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參數(shù)資料
| 型號： | μPD78070A |
| 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(jī)微控制器（8位單片微控制器） |
| 文件頁數(shù)： | 41/74頁 |
| 文件大?。?/td> | 481K |
| 代理商： | ΜPD78070A |
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m
PD78070A
40
Subsystem Clock Oscillator Characteristics
(T
A
= –40 to +85 °C, V
DD
= 2.7 to 5.5 V)
Resonator
Recommended
Parameter
Test Conditions
MIN.
TYP.
MAX.
Unit
Circuit
Crystal
Oscillation frequency
32
32.768
35
kHz
resonator
(f
XT
)
Note1
Oscillation stabilization
V
DD
= 4.5 to 5.5 V
1.2
2
s
time
Note2
10
External clock
XT1 input frequency
32
100
kHz
(f
XT
)
Note1
XT1 input high-, low-level
5
15
m
s
widths (t
XTH
, t
XTL
)
Notes 1.
Only the oscillator characteristics are shown. For the instruction execution time, refer to AC Characteristics.
2.
Time required for oscillation to stabilize after V
DD
reaches the minimum value of the oscillation voltage range.
Cautions
1.
When using the oscillation circuit of the subsystem clock, wire the portion enclosed in dotted lines
in the figures as follows to avoid adverse influences on the wiring capacitance:
Keep the wiring length as short as possible.
Do not cross the wiring over other signal lines.
Do not route the wiring in the vicinity of lines through which a high fluctuating current flows.
Always keep the ground point of the capacitor of the oscillation circuit at 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.
2.
The amplification factor of the subsystem clock oscillator is designed to be low to reduce the
current consumption and therefore, the subsystem clock oscillator is influenced by noise more
easily than the main system clock oscillator. When using the subsystem clock, therefore, exercise
utmost care in wiring the circuit.
XT2
XT1
PD74HCU04
μ
IC
C3
XT1
C4
R2
XT2
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