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H8S2245 데이터시트(PDF) 593 Page - Renesas Technology Corp

부품명 H8S2245
상세설명  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

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Section 17 Clock Pulse Generator
Rev.3.00 Mar. 26, 2007 Page 551 of 772
REJ09B0355-0300
Note on External Clock Switchover
When using two or more external clocks (e.g. 10 MHz and 32 kHz), input clock switchover should
be carried out in software standby mode.
A sample external clock switching circuit is shown in figure 17.7, and sample external clock
switchover timing in figure 17.8.
H8S/2245
EXTAL
External clock 1
External clock 2
Control
circuit
External clock switchover request
External interrupt signal
External clock switchover signal
Port output
External interrupt
Figure 17.7 Sample External Clock Switching Circuit



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