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H8S/2224 Scheda tecnica(PDF) 857 Page - Renesas Technology Corp

Il numero della parte H8S/2224
Spiegazioni elettronici  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  1071 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S/2224 Scheda tecnica(HTML) 857 Page - Renesas Technology Corp

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Section 23 Clock Pulse Generator
Rev. 5.00 Aug 08, 2006 page 771 of 982
REJ09B0054-0500
Table 23.1 Damping Resistance Value
Frequency (MHz)
2*
1
4*
1
6*
1
8*
1
10
12
16*
2
20*
2
Rd (
Ω)
1 k
500
300
200
100
0
0
0
Notes: 1. The H8S/2258 Group is out of operation.
2. Supported only by the H8S/2239 Group.
Figure 23.3 shows the equivalent circuit of the crystal resonator. Use a crystal resonator that has
the characteristics shown in table 23.2.
XTAL
CL
AT-cut parallel-resonance type
EXTAL
C0
LRs
Figure 23.3 Crystal Resonator Equivalent Circuit
Table 23.2 Crystal Resonator Characteristics
Frequency (MHz)
2*
1
4*
1
6*
1
8*
1
10
12
16*
2
20*
2
RS max (
Ω)
500
120
100
80
60
60
50
40
C0 max (pF)
77
777
777
Notes: 1. The H8S/2258 Group is out of operation.
2. Supported only by the H8S/2239 Group.
23.2.2
External Clock Input
An external clock signal can be input as shown in the examples in figure 23.4. If the XTAL pin is
left open, ensure that stray capacitance does not exceed 10 pF. When complementary clock is
input to the XTAL pin, the external clock input should be fixed high in standby mode, subactive
mode, subsleep mode, or watch mode.



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