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HD6432351 Datasheet(PDF) 714 Page - Renesas Technology Corp

Part # HD6432351
Description  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432351 Datasheet(HTML) 714 Page - Renesas Technology Corp

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Section 19 Clock Pulse Generator
Rev. 3.00 Sep 15, 2006 page 680 of 988
REJ09B0330-0300
Crystal Resonator
Figure 19.3 shows the equivalent circuit of the crystal resonator. Use a crystal resonator that has
the characteristics shown in table 19.3 and the same resonance frequency as the system clock (
φ).
XTAL
CL
AT-cut parallel-resonance type
EXTAL
C0
LRs
Figure 19.3 Crystal Resonator Equivalent Circuit
Table 19.3 Crystal Resonator Parameters
Frequency (MHz)
2
4
8
12
16
20
RS max (
Ω
Ω
Ω
Ω)
500
120
80
60
50
40
C0 max (pF)
7
7
7
7
7
7
Note 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 19.4.
When designing the board, place the crystal resonator and its load capacitors as close as possible
to the XTAL and EXTAL pins.
CL2
Signal A Signal B
CL1
H8S/2350 Group
XTAL
EXTAL
Avoid
Figure 19.4 Example of Incorrect Board Design



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