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H8SX/1663R Folha de dados(PDF) 1260 Page - Renesas Technology Corp

Nome de Peças H8SX/1663R
Descrição Electrónicos  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
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H8SX/1663R Folha de dados(HTML) 1260 Page - Renesas Technology Corp

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Section 27 Clock Pulse Generator
Rev. 2.00 Sep. 24, 2008 Page 1228 of 1468
REJ09B0412-0200
Table 27.3
Crystal Resonator Characteristics
Frequency (MHz)
8
12
16
18
R
S Max. (Ω)
80
60
50
40
C
0 Max. (pF)
7
27.2.2
External Clock Input
An external clock signal can be input as the examples in Figure 27.4. When the XTAL pin is left
open, make the parasitic capacitance less than 10 pF. When the counter clock is input to the XTAL
pin, put the external clock in high level during standby mode.
EXTAL
XTAL
External clock input
Open
(a) XTAL pin left open
EXTAL
XTAL
External clock input
(b) Counter clock input on XTAL pin
Figure 27.4 External Clock Input (Examples)
EXTAL
t
EXH
t
EXL
t
EXr
t
EXf
Vcc
× 0.5
Figure 27.5 External Clock Input Timing



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