SH7750_08 Datasheet, PDF (400/1162 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 11 Realtime Clock (RTC)
11.2.2 Second Counter (RSECCNT)
RSECCNT is an 8-bit readable/writable register used as a counter for setting and counting the
BCD-coded second value in the RTC. It counts on the carry (transition of the R64CNT.1Hz bit
from 0 to 1) generated once per second by the 64 Hz counter.
The setting range is decimal 00 to 59. 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.
RSECCNT is not initialized by a power-on or manual reset, or in standby mode.
Bit 7 is always read as 0. A write to this bit is invalid, but the write value should always be 0.
Bit:
Initial value:
R/W:
7
6
5
4
3
2
1
0
—
10-second units
1-second units
0 Undefined Undefined Undefined Undefined Undefined Undefined Undefined
R
R/W R/W R/W R/W R/W R/W R/W
11.2.3 Minute Counter (RMINCNT)
RMINCNT is an 8-bit readable/writable register used as a counter for setting and counting the
BCD-coded minute value in the RTC. It counts on the carry generated once per minute by the
second counter.
The setting range is decimal 00 to 59. 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.
RMINCNT is not initialized by a power-on or manual reset, or in standby mode.
Bit 7 is always read as 0. A write to this bit is invalid, but the write value should always be 0.
Bit:
Initial value:
R/W:
7
6
5
4
3
2
1
0
—
10-minute units
1-minute units
0 Undefined Undefined Undefined Undefined Undefined Undefined Undefined
R
R/W R/W R/W R/W R/W R/W R/W
Rev.7.00 Oct. 10, 2008 Page 316 of 1074
REJ09B0366-0700