Rev. 1.0, 03/01, page 62 of 280
C
S
C
0
R
S
OSC
1
OSC
2
L
S
Figure 5-3 Equivalent Circuit of Crystal Oscillator
Table 5-1 Crystal Oscillator Parameters
Frequency(MHz)
2
4
8
10
16
R
S
(max)
500
Ω
120
Ω
80
Ω
60
Ω
50
Ω
C
0
(max)
7 pF
7 pF
7 pF
7 pF
7 pF
5.1.2
Connecting a Ceramic Oscillator
Figure 5-4 shows a typical method of connecting a ceramic oscillator.
OSC
1
OSC
2
C
1
C
2
C
1
= 30 pF ±10%
C
2
= 30 pF ±10%
Figure 5-4 Typical Connection to Ceramic Oscillator
5.1.3
External Clock Input Method
Connect an external clock signal to pin OSC
1
, and leave pin OSC
2
open. Figure 5-5 shows a
typical connection. The duty cycle of the external clock signal must be 45 to 55%.
OSC
1
External clock input
OSC
2
Open
Figure 5-5 Example of External Clock Input
Summary of Contents for H8/3670F-ZTAT HD64F3670
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