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
—
0
6
—
0
5
4
3
2
1
0
10-day units
Undefined Undefined Undefined Undefined Undefined Undefined
R/W R/W R/W R/W R/W R/W
1-day units
Initial value:
R/W:
R
R
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.
Bits 7 to 5 are always read as 0. A write to these bits is invalid, but the write value should always
be 0.
Rev. 6.0, 07/02, page 274 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
