SH7720 Datasheet, PDF (626/1524 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

Section 17 Realtime Clock (RTC)
17.3.2 Second Counter (RSECCNT)
RSECCNT is used for setting/counting in the BCD-coded second section. The count operation is
performed by a carry for each second of the 64-Hz counter.
The range of second can be set is 00 to 59 (decimal). Errant operation will result if any other value
is set. Carry out write processing after stopping the count operation with the START bit in RCR2.
RSECCNT is not initialized by a power-on reset or manual reset, or in standby mode.
Bit
7
6 to 4
3 to 0
Bit Name

Initial Value R/W
0
R

Undefined R/W

Undefined R/W
Description
Reserved
This bit is always read as 0. The write value
should always be 0.
Counting Ten’s Position of Seconds
Counts on 0 to 5 for 60-seconds counting.
Counting One’s Position of Seconds
Counts on 0 to 9 once per second. When a carry
is generated, 1 is added to the ten’s position.
Rev. 3.00 Jan. 18, 2008 Page 564 of 1458
REJ09B0033-0300