Section 17
Clock Pulse Generator
Rev.2.00 Jun. 28, 2007 Page 557 of 666
REJ09B0311-0200
17.2 Oscillator
Clock pulses can be supplied by connecting a crystal resonator, or by input of an external clock.
17.2.1 Connecting
Crystal
Resonator
A crystal resonator can be connected as shown in the example in figure 17.2. Select the damping
resistance R
d
according to table 17.1. An AT-cut parallel-resonance type should be used.
When the clock is provided by connecting a crystal resonator, a crystal resonator having a
frequency of 8 to 18 MHz should be connected.
EXTAL
XTAL
R
d
C
L2
C
L1
C
L1
= C
L2
= 10 to 22 pF
Figure 17.2 Connection of Crystal Resonator (Example)
Table 17.1 Damping Resistance Value
Frequency (MHz)
8
12
18
R
d
(
Ω
) 200 0 0
Figure 17.3 shows an equivalent circuit of the crystal resonator. Use a crystal resonator that has
the characteristics shown in table 17.2.
XTAL
C
L
AT-cut parallel-resonance type
EXTAL
C
0
L
R
s
Figure 17.3 Crystal Resonator Equivalent Circuit
Содержание H8SX/1650
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Страница 106: ...Section 4 Exception Handling Rev 2 00 Jun 28 2007 Page 84 of 666 REJ09B0311 0200...
Страница 142: ...Section 5 Interrupt Controller Rev 2 00 Jun 28 2007 Page 120 of 666 REJ09B0311 0200...
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Страница 470: ...Section 12 Watchdog Timer WDT Rev 2 00 Jun 28 2007 Page 448 of 666 REJ09B0311 0200...
Страница 546: ...Section 13 Serial Communication Interface SCI Rev 2 00 Jun 28 2007 Page 524 of 666 REJ09B0311 0200...
Страница 566: ...Section 14 A D Converter Rev 2 00 Jun 28 2007 Page 544 of 666 REJ09B0311 0200...
Страница 574: ...Section 16 RAM Rev 2 00 Jun 28 2007 Page 552 of 666 REJ09B0311 0200...
Страница 584: ...Section 17 Clock Pulse Generator Rev 2 00 Jun 28 2007 Page 562 of 666 REJ09B0311 0200...
Страница 638: ...Section 19 List of Registers Rev 2 00 Jun 28 2007 Page 616 of 666 REJ09B0311 0200...
Страница 668: ...Section 20 Electrical Characteristics Rev 2 00 Jun 28 2007 Page 646 of 666 REJ09B0311 0200...
Страница 676: ...Appendix Rev 2 00 Jun 28 2007 Page 654 of 666 REJ09B0311 0200...
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