SH7708 Datasheet, PDF (333/625 Pages) Renesas Technology Corp – SuperH™ RISC engine

R64CNT is not initialized by a power-on reset or manual reset, or in standby mode.
Bit 7 always reads 0.
Bit: 7
Bit name: —
Initial value: 0
R/W: R
6
5
4
3
2
1
1Hz
2Hz
4Hz
8Hz 16Hz 32Hz
—
—
—
—
—
—
R
R
R
R
R
R
0
64Hz
—
R
1 2 . 2 . 2 Second Counter (RSECCNT)
The second counter (RSECCNT) is an 8-bit read/write register used for setting/counting in the
BCD-coded second section of the RTC. The count operation is performed by a carry for each second
of the 64 Hz counter.
The range that can be set is 00–59 (decimal). Errant operation will result if any other value is set.
Carry out write processing after halting the count operation with the START bit in RCR2, or
perform a write using the carry flag as shown in figure 12.2.
RSECCNT is not initialized by a power-on reset or manual reset, or in standby mode.
Bit: 7
Bit name: —
Initial value: 0
R/W: R
6
5
4
3
2
1
0
10 seconds
1 second
—
—
—
—
—
—
—
R/W R/W R/W R/W R/W R/W R/W
1 2 . 2 . 3 Minute Counter (RMINCNT)
The minute counter (RMINCNT) is an 8-bit read/write register used for setting/counting in the
BCD-coded minute section of the RTC. The count operation is performed by a carry for each
minute of the second counter.
The range that can be set is 00–59 (decimal). Errant operation will result if any other value is set.
Carry out write processing after halting the count operation with the START bit in RCR2, or
perform a write using the carry flag as shown in figure 12.2.
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