HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 93

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

4.2
Clock pulses can be supplied to the system clock divider either by connecting a crystal or ceramic
oscillator, or by providing external clock input.
Connecting a Crystal Oscillator: Figure 4.2 shows a typical method of connecting a crystal
oscillator.
Figure 4.3 shows the equivalent circuit of a crystal oscillator. An oscillator having the
characteristics given in table 4.1 should be used.
Table 4.1
Frequency
R
C
84
S
0
(max)
(max)
OSC
System Clock Generator
Crystal Oscillator Parameters
1
Figure 4.2 Typical Connection to Crystal Oscillator
Figure 4.3 Equivalent Circuit of Crystal Oscillator
OSC
OSC
1
2
2 MHz
500
7 pF
L
S
R
f
C
C
C
S
1
2
4 MHz
100
7 pF
C
0
R = 1 M
C = C = 12 pF 20%
1
f
R
2
S
8 MHz
50
7 pF
20%
10 MHz
30
7 pF
OSC
2