SH7713 Datasheet, PDF (553/904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 15 Realtime Clock (RTC)
Bit
7 to 5
4
3 to 0
Bit Name

Initial Value R/W
All 0
R


R/W


R/W
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
Counter for 10-unit of month in the BCD-code.
The range can be set from 0 to 1 (decimal).
Counter for 1-unit of month in the BCD-code.
The range can be set from 0 to 9 (decimal).
15.3.8 Year Counter (RYRCNT)
RYRCNT is used for setting/counting in the BCD-coded year section. The 4 digits of the year are
displayed. 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 stopping the count operation with the START
bit in RCR2 or using a carry flag.
RYRCNT is a 16-bit readable/writable register and not initialized by a power-on reset or manual
reset, or in standby mode.
Leap years are recognized by dividing the year counter value by 4 and obtaining a fractional result
of 0. The year counter value of 0000 is included in the leap year.
Bit
Bit Name
15 to 12 
Initial Value R/W

R/W
11 to 8 

R/W
7 to 4 

R/W
3 to 0 

R/W
Description
Counter for 1000-unit of year in the BCD-code.
The range can be set from 0 to 9 (decimal)
Counter for 100-unit of year in the BCD-code.
The range can be set from 0 to 9 (decimal).
Counter for 10-unit of year in the BCD-code.
The range can be set from 0 to 9 (decimal).
Counter for 1-unit of year in the BCD-code.
The range can be set from 0 to 9 (decimal).
Rev.1.50 Aug. 30, 2006 Page 513 of 860
REJ09B0288-0150