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| 型號： | HMS81008E |
| 廠商： | Hynix Semiconductor Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | Hynix半導(dǎo)體公司的8位單芯片微控制器 |
| 文件頁數(shù)： | 37/77頁 |
| 文件大小： | 1112K |
| 代理商： | HMS81008E |
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HMS81004E/08E/16E/24E/32E
34
JUNE 2001 Ver 1.00
10.1 Oscillation Circuit
Oscillation circuit is designed to be used either with a ce-
ramic resonator or crystal oscillator. Figure 10-2 shows
circuit diagrams using a crystal (or ceramic) oscillator. As
shown in the diagram, oscillation circuits can be construct-
ed by connecting a oscillator between Xout and Xin. Colck
from oscillation circuit makesCPU clock via clock pulse
generator, and then enters prescaler to make peripheral
hardware clock. Alternately, the oscillator may be driven
from an esternal source as Figure 10-3 . In the STOP
mode,oscillation stop, Xout state goes to “HIGH” , Xin
state goes to “LOW” , and built-in feed back resistor is dis-
abled.
Oscillation circuit is designed to be used either with a ce-
ramic resonator or crystal oscillator. Since each crystal and
ceramic resonator have their own characteristics, the user
should consult the crystal manufacturer for appropriate
values of external components. In addition, see Figure 10-
4 for the layout of the crystal.
Note:
Minimize the wiring length. Do not allow the wiring to
intersect with other signal conductors. Do not allow the wir-
ing to come near changing high current. Set the potential of
the grounding position of the oscillator capacitor to that of
V
SS
. Do not ground it to any ground pattern where high cur-
rent is present. Do not fetch signals from the oscillator.
Figure 10-4 Recommend Layout of Oscillator PCB
circuit
Figure 10-2 External Crystal(Ceramic) oscillator circuit
Figure 10-3 External clock input circuit
Xout
Xin
Vss
Cout
Cin
Xout
Xin
Vss
OPEN
External
Clock
Source
X
OUT
X
IN
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