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| 型號： | GMS87C2020Q |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
| 中文描述： | CMOS單芯片8位微控制器與A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 86/107頁 |
| 文件大?。?/td> | 1482K |
| 代理商： | GMS87C2020Q |
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HMS81C2012A/2020A
82
SEP. 2004 Ver 2.00
18. OSCILLATOR CIRCUIT
The HMS81C20xxA has two oscillation circuits internal-
ly. X
IN
and X
OUT
are input and output for main frequency
and SX
IN
and SX
OUT
are input and output for sub frequen-
cy, respectively, inverting amplifier which can be config-
ured for being used as an on-chip oscillator, as shown in
Figure 18-1.
Figure 18-1 Oscillation Circuit
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.
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 18-2 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 18-2 Layout of Oscillator PCB circuit
X
OUT
X
IN
V
SS
Recommend
C1,C2 = 20pF
C1
C2
X
OUT
X
IN
External Clock
Open
X
OUT
X
IN
External Oscillator
RC Oscillator
(mask option)
Crystal or Ceramic Oscillator
SX
OUT
SX
IN
V
SS
Recommend
C1,C2 = 100~120pF
C1
C2
32.768KHz
4.19MHz
Crystal Oscillator
Ceramic Resonator
C1,C2 = 30pF
Refer to AC Characteristics
For selection R value,
R
EXT
X
OUT
X
IN
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