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SH7713 Datasheet(PDF) 548 Page - Renesas Technology Corp

Part # SH7713
Description  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
PDF  904 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7713 Datasheet(HTML) 548 Page - Renesas Technology Corp

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Section 15 Realtime Clock (RTC)
Rev.1.50 Aug. 30, 2006 Page 508 of 860
REJ09B0288-0150
• RTC control register 1 (RCR1)
• RTC control register 2 (RCR2)
• RTC control register 3 (RCR3)
15.3.1
64-Hz Counter (R64CNT)
R64CNT indicates the state of the divider circuit (RTC prescaler and R64CNT) between 64 Hz
and 1 Hz.
R64CNT is reset to H'00 by setting the RESET bit in RCR2 or the ADJ bit in RCR2 to 1.
R64CNT is an 8-bit read-only register and not initialized by a power-on reset or manual reset, or
in standby mode.
Bit
Bit Name
Initial Value
R/W
Description
7
0
R
Reserved
This bit is always read as 0.
6 to 0
R
64-Hz Counter
Each bit (bits 6 to 0) indicates the state of the
RTC divider circuit between 64 and 1Hz.
Bit
Frequency
6:
1 Hz
5:
2 Hz
4:
4 Hz
3:
8 Hz
2:
16 Hz
1:
32 Hz
0:
64 Hz
15.3.2
Second Counter (RSECCNT)
RSECCNT is used for setting/counting in the BCD-coded second section. The count operation is
performed by a carry for each second of the 64-Hz counter.
The range of second can be set is 0 to 59 (decimal). Errant operation will result if any other value
is set. Carry out write processing after stopping the count operation with the START bit in RCR2.



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