Hitachi F-ZTAT H8/3039 Series Hardware Manual page 503

Single-chip microcomputer
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Table 16-2 Crystal Resonator Parameters
Frequency (MHz) 2
Rs max (Ω)
500
Co (pF)
7 pF max 7 pF max 7 pF max 7 pF max 7 pF max 7 pF max 7 pF max
Use a crystal resonator with a frequency equal to the system clock frequency (ø).
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 16-4.
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.
Avoid
C
C
494
4
120
Signal A Signal B
L2
L1
Figure 16-4 Example of Incorrect Board Design
8
10
80
70
(Preliminary)
12
16
60
50
LSI
XTAL
EXTAL
18
40

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