HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 644

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

Table 19-2 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 19-4.
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.
XTAL
Avoid
C
C
L2
L1
Figure 19-3 Crystal Resonator Equivalent Circuit
2
500
Figure 19-4 Example of Incorrect Board Design
L
4
120
Signal A
C
8
80
L
7 pF max
635
10
70
C
0
Signal B
12
60
AT-cut parallel-resonance type
Rs
XTAL
EXTAL
H8/3048 Series
16
50
18
40
EXTAL