HD64F3039F18 Datasheet, PDF (523/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

16.2.1 Connecting a Crystal Resonator
Section 16 Clock Pulse Generator
Circuit Configuration
A crystal resonator can be connected as in the example in figure 16.2. The damping resistance Rd
should be selected according to table 16.1. An AT-cut parallel-resonance crystal should be used.
C _L1
EXTAL
XTAL
Rd
C _L2
C_L1 = C _L2 = 10 pF to 22 pF
Figure 16.2 Connection of Crystal Resonator (Example)
Table 16.1 Damping Resistance Value (Example)
Frequency (MHz) 2
4
8
10
12
16
18
Rd (Ω)
1k
500
200
0
0
0
0
Crystal Resonator
Figure 16.3 shows an equivalent circuit of the crystal resonator. The crystal resonator should have
the characteristics listed in table 16.2.
XTAL
C_L
L
Rs
EXTAL
C_O
AT-cut parallel-resonance type
Figure 16.3 Crystal Resonator Equivalent Circuit
Rev.3.00 Mar. 26, 2007 Page 499 of 682
REJ09B0353-0300