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SH7124 bảng dữ liệu(PDF) 86 Page - Renesas Technology Corp

tên linh kiện SH7124
Giải thích chi tiết về linh kiện  Renesas 32-Bit RISC Microcomputer
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SH7124 bảng dữ liệu(HTML) 86 Page - Renesas Technology Corp

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Section 4
Clock Pulse Generator (CPG)
Rev. 3.00
Sep. 27, 2007
Page 66 of 758
REJ09B0243-0300
4.6
Oscillator
Clock pulses can be supplied from a connected crystal resonator or an external clock.
4.6.1
Connecting Crystal Resonator
A crystal resonator can be connected as shown in figure 4.2. Use the damping resistance (Rd)
listed in table 4.6. Use a crystal resonator that has a resonance frequency of 10 to 12.5 MHz. It is
recommended to consult the crystal resonator manufacturer concerning the compatibility of the
crystal resonator and the LSI.
EXTAL
XTAL
Rd
CL2
CL1
CL1 = CL2 = 18 to 22 pF (Reference values)
Figure 4.2
Connection of Crystal Resonator (Example)
Table 4.6
Damping Resistance Values (Reference Values)
Frequency (MHz)
10
12.5
Rd (
Ω) (Reference Values)
0
0
Figure 4.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator with the
characteristics listed in table 4.7.
XTAL
CL
EXTAL
C0
L
Rs
Figure 4.3
Crystal Resonator Equivalent Circuit



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