SH7730 Datasheet, PDF (578/1188 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7780 Series

Section 17 Realtime Clock (RTC)
17.3.8 Year Counter (RYRCNT)
RYRCNT is used for setting/counting in the BCD-coded year section. The count operation is
performed by a carry for each year of the month counter.
The range for year, which can be set, is 0000 to 9999 (decimal). Errant operation will result if any
other value is set. Carry out write processing after halting the count operation with the START bit
in RCR2 or using a carry flag.
RYRCNT is not initialized by a power-on reset or manual reset, or in standby mode.
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
1000-year units
100-year units
10-year units
1-year units
Initial value: — — — — — — — — — — — — — — — —
R/W: R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial
Bit
Bit Name Value
R/W
15 to 12 
Undefined R/W
11 to 8 
Undefined R/W
7 to 4 
Undefined R/W
3 to 0 
Undefined R/W
Description
Counting Thousand’s Position of Years
Counting Hundred’s Position of Years
Counting Ten’s Position of Years
Counting One’s Position of Years
Rev. 1.00 Sep. 19, 2007 Page 530 of 1136
REJ09B0359-0100