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H8S/2214 Scheda tecnica(PDF) 671 Page - Renesas Technology Corp

Il numero della parte H8S/2214
Spiegazioni elettronici  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  936 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S/2214 Scheda tecnica(HTML) 671 Page - Renesas Technology Corp

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Section 16 Clock Pulse Generator
Rev.4.00 Sep. 18, 2008 Page 611 of 872
REJ09B0189-0400
16.3.2
External Clock Input
(1) Circuit Configuration
An external clock signal can be input as shown in the examples in figure 16.5. If the XTAL pin is
left open, make sure that stray capacitance is no more than 10 pF.
In example (b), make sure that the external clock is held high in standby mode, subactive mode,
subsleep mode, and watch mode.
EXTAL
XTAL
External clock input
Open
(a) XTAL pin left open
EXTAL
XTAL
External clock input
(b) Complementary clock input at XTAL pin
Figure 16.5 External Clock Input (Examples)
(2) External Clock
The external clock signal should have the same frequency as the system clock (
φ).
Table 16.4 and figure 16.6 show the input conditions for the external clock.



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