參數(shù)資料
型號: μPD789417
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位單片機微控制器(8位單片微控制器)
文件頁數(shù): 105/126頁
文件大?。?/td> 590K
代理商: ΜPD789417
105
μ
PD789415, 789416, 789417
XT1
XT2
PD74HCU04
μ
CHARACTERISTICS OF THE MAIN SYSTEM CLOCK OSCILLATION CIRCUIT
(T
A
=
40 to +85
°
C, V
DD
= 1.8 to 5.5 V)
(Target values)
Resonator
Recommended
circuit
Parameter
Conditions
MIN.
TYP.
MAX.
Unit
Crystal
Oscillator frequency (f
XT
)
Note 1
32
32.768
35
kHz
Oscillation settling time
Note 2
V
DD
= 4.5 to 5.5 V
1.2
2
s
10
External
clock
XT1 input frequency (f
XT
)
Note 1
32
35
kHz
XT1 input high/low level
width (t
XTH
, t
XTL
)
14.3
15.6
μ
s
Notes 1.
Only the characteristic of the oscillation circuit is indicated. See the description of the AC
characteristic for the instruction execution time.
2.
Time required for oscillation to settle after V
DD
reaches the MIN. value of the oscillation voltage range.
Cautions 1. When using the subsystem clock oscillation circuit, observe the following conditions for
the wiring of that section enclosed in dotted lines in the above diagrams, so as to avoid the
influence of the wiring capacitance.
Keep the wiring as short as possible.
Do not allow signal wires to cross one another.
Keep the wiring away from wires that carry a high, non-stable current.
Keep the grounding point of the capacitors at the same level as V
SS
.
Do not connect the grounding point to a grounding wire that carries a high current.
Do not extract a signal from the oscillation circuit.
2. The subsystem clock oscillation circuit is designed to have a low amplification degree so
as to maintain a low current drain. Therefore, it is more likely to malfunction as a result of
noise than the main system clock oscillation circuit. When using the subsystem clock,
therefore, pay particularly careful attention to how it is wired.
XT1
R2
XT2
IC
C3
C4
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