SH7261 Datasheet, PDF (679/1348 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 15 Realtime Clock (RTC)
15.3.6 Date Counter (RDAYCNT)
RDAYCNT is used for setting/counting in the BCD-coded date section. The count operation is
performed by a carry for each day of the hour counter.
The assignable range is from 01 through 31 (practically in BCD), otherwise operation errors occur.
Carry out write processing after stopping the count operation through the setting of the START bit
in RCR2.
RDAYCNT is not initialized by a power-on reset or manual reset, or in deep standby and software
standby modes.
The range of date changes with each month and in leap years. Please confirm the correct setting.
Leap years are recognized by dividing the year counter values by 400, 100, and 4 and obtaining a
fractional result of 0. The year counter value of 0000 is included in the leap year.
Bit: 7
—
Initial value: 0
R/W: R
6
5
4
3
2
1
0
— 10 days
1 day
0 ——————
R R/W R/W R/W R/W R/W R/W
Bit Bit Name
7, 6 
5, 4 10 days
3 to 0 1 day
Initial
Value
R/W
All 0
R
Undefined R/W
Undefined R/W
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
Counting Ten's Position of Dates
Counting One's Position of Dates
Counts on 0 to 9 once per date. When a carry is
generated, 1 is added to the ten's position.
Rev. 2.00 Sep. 07, 2007 Page 647 of 1312
REJ09B0320-0200