HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 99

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

4.1
Clock pulses can be supplied from a connected crystal resonator or an external clock.
4.1.1
A crystal resonator can be connected as shown in figure 4.2. Use the damping resistance (Rd)
listed in table 4.2. Use an crystal resonator that has a resonance frequency of 4 to 12.5 MHz. It is
recommended to consult the crystal resonator manufacturer concerning the compatibility of the
crystal resonator and the LSI.
Table 4.2
Figure 4.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator with the
characteristics listed in table 4.3.
Frequency (MHz)
Rd (Ω)
Oscillator
Connecting Crystal Resonator
Damping Resistance Values (Recommended Values)
EXTAL
XTAL
Figure 4.2 Connection of Crystal Resonator (Example)
Figure 4.3 Crystal Resonator Equivalent Circuit
R
d
XTAL
4
500
C
C
L1
L2
L
C
L1
C
C
8
200
L
0
= C
L2
R s
= 18–22 pF (Recommended value)
Rev.4.00 Mar. 27, 2008 Page 55 of 882
EXTAL
10
0
4. Clock Pulse Generator
REJ09B0108-0400
12.5
0