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HD64F2149YV Datasheet(PDF) 766 Page - Renesas Technology Corp

No. de pieza HD64F2149YV
Descripción Electrónicos  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
PDF  1075 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
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HD64F2149YV Datasheet(HTML) 766 Page - Renesas Technology Corp

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Section 23 Clock Pulse Generator
Rev. 3.00 Jan 18, 2006 page 738 of 1044
REJ09B0280-0300
23.3
Oscillator
Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.
23.3.1
Connecting a Crystal Resonator
Circuit Configuration: A crystal resonator can be connected as shown in the example in figure
23.2. Select the damping resistance R
d according to table 23.2. An AT-cut parallel-resonance
crystal should be used.
EXTAL
XTAL
Rd
CL2
CL1
CL1 = CL2 = 10 to 22pF
Figure 23.2 Connection of Crystal Resonator (Example)
Table 23.2
Damping Resistance Value
Frequency (MHz)
24810
R
d (Ω)
1k
500
200
0
Crystal resonator: Figure 23.3 shows the equivalent circuit of the crystal resonator. Use a crystal
resonator that has the characteristics shown in table 23.3 and the same frequency as the system
clock (
φ).
XTAL
CL
AT-cut parallel-resonance type
EXTAL
C0
LRs
Figure 23.3 Crystal Resonator Equivalent Circuit



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