h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 761

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Table 21.2 Damping Resistance Value
Crystal Resonator: Figure 21.3 shows the equivalent circuit of the crystal resonator. Use a crystal
resonator that has the characteristics shown in table 18.3. The crystal resonator frequency should
not exceed 20 MHz.
Table 21.3 Crystal Resonator Parameters
Note on Board Design: When a crystal resonator is connected, the following points should be
noted:
Other signal lines should be routed away from the oscillator circuit to prevent induction from
interfering with correct oscillation. See figure 21.4.
When designing the board, place the crystal resonator and its load capacitors as close as possible
to the XTAL and EXTAL pins.
Frequency (MHz)
R
Frequency (MHz)
R
C
d
S
0
(Ω)
max (pF)
max (Ω)
XTAL
Figure 21.3 Crystal Resonator Equivalent Circuit
4
500
4
120
7
L
C
C
8
200
8
80
7
L
0
AT-cut parallel-resonance type
R
s
Rev. 5.00 Sep 22, 2005 page 735 of 1136
12
0
12
60
7
EXTAL
Section 21 Clock Pulse Generator
16
0
16
50
7
REJ09B0257-0500
20
0
20
40
7