Rev.6.00 Oct.28.2004 page 663
of 1016
REJ09B0138-0600H
20.3
Oscillator
Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.
20.3.1
Connecting a Crystal Resonator
Circuit Configuration: A crystal resonator can be connected as shown in the example in figure 20-2. Select the damping
resistance R
d
according to table 20-2. An AT-cut parallel-resonance crystal should be used.
EXTAL
XTAL
R
d
C
L2
C
L1
C
L1
= C
L2
= 10 to 22 pF
Figure 20-2 Connection of Crystal Resonator (Example)
Table 20-2 Damping Resistance Value
Frequency (MHz)
2
4
8
10
12
16
20
R
d
(
Ω
)
1k
500
200
0
0
0
0
Crystal Resonator: Figure 20-3 shows the equivalent circuit of the crystal resonator. Use a crystal resonator that has the
characteristics shown in table 20-3 and the same resonance frequency as the system clock (ø).
XTAL
C
L
AT-cut parallel-resonance type
EXTAL
C
0
L
R
s
Figure 20-3 Crystal Resonator Equivalent Circuit
Table 20-3 Crystal Resonator Parameters
Frequency (MHz)
2
4
8
10
12
16
20
R
S
max (
Ω
)
500
120
80
70
60
50
40
C
0
max (pF)
7
7
7
7
7
7
7
Summary of Contents for ZTAT H8S/2357F
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