HD643303x Hitachi, HD643303x Datasheet - Page 422

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

Table 15-2 Crystal Resonator Parameters
Frequency (MHz)
Rs max (Ω)
Co (pF)
Use a crystal resonator with a frequency equal to the system clock frequency (ø).
Notes 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 15-4.
When the board is designed, the crystal resonator and its load capacitors should be placed as close
as possible to the XTAL and EXTAL pins.
Avoid
C
C
L2
L1
Figure 15-4 Example of Incorrect Board Design
2
500
Signal A
4
120
8
80
407
7 pF max
Signal B
10
70
XTAL
EXTAL
12
60
H8/3032 Series
16
50