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4.2
System Clock Generator
Clock pulses can be supplied to the system clock divider either by connecting a crystal or ceramic
oscillator, or by providing external clock input.
1. Connecting a crystal oscillator
Figure 4-2 shows a typical method of connecting a crystal oscillator.
OSC
1
R
f
OSC
2
Figure 4-2 Typical Connection to 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.
OSC
1
Table 4-1
Crystal Oscillator Parameters
Frequency
R
(max)
S
C
(max)
0
86
C
R = 1 MΩ ±20%
1
f
Oscillation
frequency
4.0 MHz
C
2
L
S
Figure 4-3 Equivalent Circuit of Crystal Oscillator
4.193 MHz
100 Ω
16 pF
Manufacturer
Nihon Denpa Kogyo 12 pF ±20%
C
S
R
C
0
Recommended value
for C
and C
1
S
OSC
2
2
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