4. Clock Pulse Generators
Rev.3.00 Jul. 19, 2007 page 94 of 532
REJ09B0397-0300
The clock signals available for use by peripheral modules are
φ
/2,
φ
/4,
φ
/8,
φ
/16,
φ
/32,
φ
/64,
φ
/128,
φ
/256,
φ
/512,
φ
/1024,
φ
/2048,
φ
/4096,
φ
/8192,
φ
W
,
φ
W
/2,
φ
W
/4,
φ
W
/8,
φ
W
/16,
φ
W
/32,
φ
W
/64,
and
φ
W
/128. The clock requirements differ from one module to another.
4.2
System Clock Generator
Clock pulse 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.
1
2
C
1
C
2
OSC
OSC
R = 1 M
±
20
%
C = C = 12 pF
±
20
%
f
1
2
Ω
R
f
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.
C
S
C
0
R
S
OSC
1
OSC
2
L
S
Figure 4.3 Equivalent Circuit of Crystal Oscillator
Table 4.1
Crystal Oscillator Parameters
Frequency
(MHz)
2 4 8 10
R
s
(max)
500
Ω
100
Ω
50
Ω
30
Ω
C
0
(max)
7 pF
7 pF
7 pF
7 pF
Summary of Contents for F-ZTAT H8 Series
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