H8S-2350 RENESAS [Renesas Technology Corp], H8S-2350 Datasheet - Page 714

• Manufacturer Part Number: H8S-2350
• Description: 16-Bit Single-Chip Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 19 Clock Pulse Generator
Crystal Resonator
Figure 19.3 shows the equivalent circuit of the crystal resonator. Use a crystal resonator that has
the characteristics shown in table 19.3 and the same resonance frequency as the system clock ( ).
Table 19.3 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 19.4.
When designing the board, place the crystal resonator and its load capacitors as close as possible
to the XTAL and EXTAL pins.
Rev. 3.00 Sep 15, 2006 page 680 of 988
REJ09B0330-0300
Frequency (MHz)
R
C
S
0
max (pF)
max ( )
XTAL
Figure 19.3 Crystal Resonator Equivalent Circuit
Figure 19.4 Example of Incorrect Board Design
Avoid
2
500
7
C
C
L2
L1
L
Signal A Signal B
4
120
7
C
C
L
0
AT-cut parallel-resonance type
R
s
8
80
7
H8S/2350 Group
XTAL
EXTAL
EXTAL
12
60
7
16
50
7
20
40
7