SH7750_08 Datasheet, PDF (402/1162 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 11 Realtime Clock (RTC)
Day-of-week code
0
1
2
3
4
5
6
Day of week
Sun
Mon
Tue
Wed
Thu
Fri
Sat
11.2.6 Day Counter (RDAYCNT)
RDAYCNT is an 8-bit readable/writable register used as a counter for setting and counting the
BCD-coded day value in the RTC. It counts on the carry generated once per day by the hour
counter.
The setting range is decimal 01 to 31. The RTC will not operate normally if any other value is set.
Write processing should be performed after stopping the count with the START bit in RCR2, or
by using the carry flag.
RDAYCNT is not initialized by a power-on or manual reset, or in standby mode.
The setting range for RDAYCNT depends on the month and whether the year is a leap year, so
care is required when making the setting. Taking the year counter (RYRCNT) value as the year,
leap year calculation is performed according to whether or not the value is divisible by 400, 100,
and 4.
Bits 7 and 6 are always read as 0. A write to these bits is invalid, but the write value should always
be 0.
Bit: 7
—
Initial value: 0
R/W: R
6
5
4
3
2
1
0
—
10-day units
1-day units
0 Undefined Undefined Undefined Undefined Undefined Undefined
R
R/W R/W R/W R/W R/W R/W
11.2.7 Month Counter (RMONCNT)
RMONCNT is an 8-bit readable/writable register used as a counter for setting and counting the
BCD-coded month value in the RTC. It counts on the carry generated once per month by the day
counter.
The setting range is decimal 01 to 12. The RTC will not operate normally if any other value is set.
Write processing should be performed after stopping the count with the START bit in RCR2, or
by using the carry flag.
RMONCNT is not initialized by a power-on or manual reset, or in standby mode.
Rev.7.00 Oct. 10, 2008 Page 318 of 1074
REJ09B0366-0700