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Crystal Resonator: Figure 17.3 shows an equivalent circuit of the crystal resonator. The crystal
resonator should have the characteristics listed in table 17.2.
XTAL
L
Rs
C
L
C
0
EXTAL
AT-cut parallel-resonance type
Figure 17.3 Crystal Resonator Equivalent Circuit
Table 17.2
Crystal Resonator Parameters
Frequency (MHz)
2
4
8
10
12
16
18
20
25
Rs max (
Ω
)
500
120
80
70
60
50
40
40
TBD
Co (pF)
7 pF max
Use a crystal resonator with a frequency equal to the system clock frequency (
φ
).
Notes on Board Design: When a crystal resonator is connected, the following points should be
noted:
Other signal lines should be routed away from the oscillator circuit to prevent induction from
interfering with correct oscillation. See figure 17.4.
When the board is designed, the crystal resonator and its load capacitors should be placed as close
as possible to the XTAL and EXTAL pins.
XTAL
EXTAL
C
L2
C
L1
H8/3008
Avoid
Signal A
Signal B
Figure 17.4 Oscillator Circuit Block Board Design Precautions
Содержание H8/3008
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