GMS81508B HYNIX [Hynix Semiconductor], GMS81508B Datasheet - Page 72

• Manufacturer Part Number: GMS81508B
• Description: HYUNDAI MICRO ELECTRONICS 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: HYNIX [Hynix Semiconductor]

HYUNDAI MicroElectronics
19. OSCILLATOR CIRCUIT
The GMS815xxB has two oscillation circuits internally.
X
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 19-2 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
rent is present. Do not fetch signals from the oscillator.
DEC. 1999 Ver 1.04
SS
IN
. Do not ground it to any ground pattern where high cur-
and X
OUT
Recommend
are input and output for frequency, respec-
Crystal Oscillator
Crystal or Ceramic Oscillator
C2
C1
8MHz
C1,C2 = 30pF±10pF
X
X
V
OUT
IN
SS
Figure 19-1 Oscillation Circuit
tively, inverting amplifier which can be configured for be-
ing used as an on-chip oscillator, as shown in Figure 19-1.
Figure 19-2 Layout of Oscillator PCB circuit
External Clock
X
X
OUT
IN
External Oscillator
Open
GMS81508B/16B/24B
X
X
IN
OUT
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