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SH7721 Datasheet(PDF) 642 Page - Renesas Technology Corp

Part # SH7721
Description  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
PDF  1524 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7721 Datasheet(HTML) 642 Page - Renesas Technology Corp

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Section 17 Realtime Clock (RTC)
Rev. 3.00 Jan. 18, 2008 Page 580 of 1458
REJ09B0033-0300
17.4
Operation
RTC usage is shown below.
17.4.1
Initial Settings of Registers after Power-On
All the registers should be set after the power is turned on.
17.4.2
Setting Time
Figure 17.2 shows how to set the time when the clock is stopped.
Write 1 to RESET and 0 to
START in the RCR2 register
Order is irrelevant
Write 1 to START in the
RCR2 register
Set seconds, minutes,
hour, day, day of the
week, month, and year
Stop clock,
reset divider circuit
Start clock
Figure 17.2 Setting Time



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