參數(shù)資料
型號: μPD78F9217Y
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): 126/148頁
文件大小: 621K
代理商: ΜPD78F9217Y
Preliminary Product Information
126
μ
PD78F9217Y
CHARACTERISTICS OF THE SUBSYSTEM CLOCK OSCILLATION CIRCUIT
(T
A
=
40
°
C to +85
°
C, V
DD
= 1.8 to 5.5 V)
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
XT2
R
C3
C4
XT1
XT2
相關PDF資料
PDF描述
μPD78F9418 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD78F9801 8 Bit Single Chip Microcontrollers
μPD78P0208 8 Bit Single Chip Microcontrollers(8位單片微控制器)
μPD78P0308Y 8 Bit Single Chip Microcontrollers
μPD9210FGC-7EA USB Host Controller(USB主控制器)
相關代理商/技術(shù)參數(shù)
參數(shù)描述
PD7935 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:FOR OPTICAL COMMUNICATION
PD7937 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:InGaAs PIN PHOTO DIODES
PD793D26 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:InGaAs PIN PHOTO DIODES
PD793D7 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:InGaAs PIN PHOTO DIODES
PD79920-0M 制造商:Citizen Systems America Corporation 功能描述:Mobile Printer - PD24 USB Cable