HD64F3039F18 Datasheet, PDF (524/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 16 Clock Pulse Generator
Table 16.2 Crystal Resonator Parameters
Frequency (MHz) 2
4
8
10
12
16
18
Rs max (Ω)
500
120
80
70
60
50
40
Co max (pF)
7
7
7
7
7
7
7
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 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 _L2
Signal A Signal B
LSI
XTAL
EXTAL
C _L1
Figure 16.4 Example of Incorrect Board Design
Rev.3.00 Mar. 26, 2007 Page 500 of 682
REJ09B0353-0300