Connecting A Ceramic Oscillator; External Clock Input Method - Hitachi H8/3672 Series Hardware Manual

OSC
Table 5-1 Crystal Oscillator Parameters
Frequency(MHz)
R (max)
S
C (max)
0
5.1.2

Connecting a Ceramic Oscillator

Figure 5-4 shows a typical method of connecting a ceramic oscillator.
Figure 5-4 Typical Connection to Ceramic Oscillator
5.1.3

External Clock Input Method

Connect an external clock signal to pin OSC
typical connection. The duty cycle of the external clock signal must be 45 to 55%.
Rev. 1.0, 03/01, page 62 of 280
L
S
1
Figure 5-3 Equivalent Circuit of Crystal Oscillator
2 4
500 Ω 120 Ω
7 pF 7 pF
OSC
1
OSC
2
OSC
1
OSC
2
Figure 5-5 Example of External Clock Input
R
S
C
S
C
0
8
80 Ω
7 pF
C
1
C
2
C = 30 pF ±10%
1
C = 30 pF ±10%
2
, and leave pin OSC
1 2
External clock input
Open
OSC
2
10 16
60 Ω 50 Ω
7 pF 7 pF
open. Figure 5-5 shows a