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參數(shù)資料
| 型號(hào)： | μPD784214 |
| 廠商： | NEC Corp. |
| 英文描述： | 8/16 Bit Single Chip Microcontrollers(8/16 位單片微控制器) |
| 中文描述： | 8 / 16位單片機(jī)微控制器（8 / 16位單片微控制器） |
| 文件頁(yè)數(shù)： | 63/88頁(yè) |
| 文件大?。?/td> | 427K |
| 代理商： | ΜPD784214 |
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μ
PD784214,784215,784216
63
Subsystem Clock Oscillator Characteristics (T
A
= –40 to +85
°
C)
Resonator Recommended Circuit
Parameter
Test Conditions
MIN.
TYP.
MAX.
Unit
Crystal
resonator
Oscillation
frequency (f
XT
)
32
32.768
35
kHz
Oscillation
stabilization time
Note
4.5 V
≤
V
DD
≤
5.5 V
1.2
2
s
2.2 V
≤
V
DD
< 4.5 V
10
External
clock
XT1 input
frequency (f
XT
)
32
35
kHz
XT1 input high/low-
level width (t
XTH
, t
XTL
)
5
15
μ
s
Note
Time required to stabilize oscillation after V
DD
reaches oscillator voltage MIN.
Cautions 1. When using the subsystem 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
SS
.
Do not ground the capacitor to a ground pattern in which a high current flows.
Do not fetch signals from the oscillator.
2. When the main system clock is stopped and the system is operated by the subsystem clock,
the subsystem clock should be switched back to the main system clock after the oscillation
stabilization time is secured by the program.
V
SS
XT2
XT1
XT2
XT1
PD74HCU04
μ
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