R5F61525 RENESAS [Renesas Technology Corp], R5F61525 Datasheet - Page 703

• Manufacturer Part Number: R5F61525
• Description: 32-Bit CISC Microcomputer H8SX Family H8SX/1500 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

18.2
Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.
18.2.1
A crystal resonator can be connected as shown in the example in figure 18.2. Select the damping
resistance R
When the clock is provided by connecting a crystal resonator, a crystal resonator having a
frequency of 4 to 9 MHz should be connected.
Table 18.1 Damping Resistance Value
Figure 18.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator that has
the characteristics shown in table 18.2.
Frequency (MHz)
R
d
(Ω)
Oscillator
Connecting Crystal Resonator
d
according to table 18.1. An AT-cut parallel-resonance type should be used.
XTAL
Figure 18.2 Connection of Crystal Resonator (Example)
Figure 18.3 Crystal Resonator Equivalent Circuit
EXTAL
XTAL
4
500
R
d
L
C
C
L1
L2
6
300
C
C
L
0
AT-cut parallel-resonance type
10 pF
R
s
Rev. 3.00 Mar. 14, 2006 Page 665 of 804
C
8
200
L1
= C
Section 18 Clock Pulse Generator
L2
22 pF
EXTAL
REJ09B0104-0300
9
100