HD6432670 Hitachi, HD6432670 Datasheet - Page 826

• Manufacturer Part Number: HD6432670
• Description: (HD64F267x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

21.2.1
A crystal resonator can be connected as shown in the example in figure 21.2. Select the damping
resistance R
Figure 21.3 shows the equivalent circuit of the crystal resonator. Use a crystal resonator that has
the characteristics shown in table 21.2.
Table 21.1 Damping Resistance Value
Frequency (MHz)
R
Table 21.2 Crystal Resonator Characteristics
Frequency (MHz)
R
C
Rev. 2.0, 04/02, page 780 of 906
d
S
0
( )
max (pF)
max ( )
Connecting a Crystal Resonator
d
according to table 20.1. An AT-cut parallel-resonance type should be used.
Figure 21.2 Connection of Crystal Resonator (Example)
XTAL
EXTAL
XTAL
Figure 21.3 Crystal Resonator Equivalent Circuit
8
200
8
80
7
R
d
L
12
0
12
60
7
C
C
C
C
L
0
L1
L2
AT-cut parallel-resonance type
R
s
16
0
16
50
7
C
L1
= C
EXTAL
L2
= 10 to 22 pF
20
0
20
40
7
25
0
25
40
7