HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 494

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

17. Clock Pulse Generator
Table 17.1 (2)
External Capacitance Value
Frequency f (MHz)
C
Crystal Resonator: Figure 17.3 shows an equivalent circuit of the crystal resonator. The crystal
resonator should have the characteristics listed in table 17.2.
Table 17.2 Crystal Resonator Parameters
Frequency (MHz)
Rs max (Ω)
Co (pF)
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 17.4.
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.
Rev.4.00 Aug. 20, 2007 Page 450 of 638
REJ09B0395-0400
L1
XTAL
= C
L2
(pF)
External Capacitance Values
Figure 17.3 Crystal Resonator Equivalent Circuit
2
500
L
4
120
5 V Version
20 < f ≤ 25
10
C
8
80
L
10
70
2 ≤ f ≤ 20
10 to 22
C
0
7 pF max
12
60
AT-cut parallel-resonance type
16
50
3 V Version
2 ≤ f ≤ 16
22
Rs
18
40
20
40
16 ≤ f ≤ 25
10
EXTAL
25
40