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GMS81C2112 Datasheet(PDF) 85 Page - Hynix Semiconductor

No. de Pieza. GMS81C2112
Descripción  HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS
Descarga  107 Pages
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Fabricante  HYNIX [Hynix Semiconductor]
Página de inicio  http://www.skhynix.com/ko/index.jsp
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GMS81C2112 Datasheet(HTML) 85 Page - Hynix Semiconductor

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GMS81C2112/GMS81C2120
JUNE. 2001 Ver 1.00
79
18. OSCILLATOR CIRCUIT
The GMS81C21xx has an oscillation circuits internally.
XIN and XOUT are input and output for main frequency re-
spectively, inverting amplifier which can be configured 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
VSS. 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
XOUT
XIN
VSS
Recommend
C1,C2 = 20pF
C1
C2
XOUT
XIN
External Clock
Open
XOUT
XIN
External Oscillator
RC Oscillator (mask option)
Crystal or Ceramic Oscillator
4.19MHz
Crystal Oscillator
Ceramic Resonator
C1,C2 = 30pF
Refer to AC Characteristics
For selection R value,
REXT
XOUT
XIN


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