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HD6433637SW Datasheet(PDF) 94 Page - Renesas Technology Corp

Part # HD6433637SW
Description  8-Bit Microcomputer
PDF  418 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433637SW Datasheet(HTML) 94 Page - Renesas Technology Corp

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80
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
C1
C2
OSC
OSC
R = 1 M
±20%
C = C = 12 pF
±20%
f
12
Ω
Rf
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.
CS
C0
RS
OSC1
OSC2
LS
Figure 4.3 Equivalent Circuit of Crystal Oscillator
Table 4.1
Crystal Oscillator Parameters
Frequency
2 MHz
4 MHz
8 MHz
10 MHz
R
S (max)
500
Ω
100
Ω
50
Ω
30
Ω
C
0 (max)
7 pF
7 pF
7 pF
7 pF



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