RX610 Group
7. Clock Generation Circuit
R01UH0032EJ0120 Rev.1.20
Page 164 of 1006
Feb 20, 2013
7.3
Main Clock Oscillator
Clock pulses can be supplied by connecting a crystal resonator or by inputting an external clock.
7.3.1
Connecting a Crystal Resonator
Figure 7.2 shows an example of connecting a crystal resonator. Table 7.4 shows reference values of the damping
resistance (Rd).
When supplying the clock from the crystal resonator, the frequency of the resonator should be in the range of 8 to 14
MHz.
EXTAL
XTAL
C
L1
C
L2
R
d
C
L1
= C
L2
= 10 to 22 pF
Figure 7.2 Example of Crystal Resonator Connection
Table 7.4 Damping Resistance (Reference Values)
Frequency (MHz)
8
10
12
14
Rd (
Ω
)
200
100
0
0
Figure 7.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator that has the characteristics shown
in table 7.5.
C
L
R
S
XTAL
EXTAL
L
C
0
Figure 7.3 Equivalent Circuit of Crystal Resonator
Table 7.5 Crystal Resonator Characteristics (Reference Values)
Frequency (MHz)
8
10
12
14
Rs max (
Ω
)
80
70
60
50
C0 max (pF)
7
Summary of Contents for RX600 Series
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