SH7261 Datasheet, PDF (677/1348 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 15 Realtime Clock (RTC)
15.3.4 Hour Counter (RHRCNT)
RHRCNT is used for setting/counting in the BCD-coded hour section. The count operation is
performed by a carry for each 1 hour of the minute counter.
The assignable range is from 00 through 23 (practically in BCD), otherwise operation errors occur.
Carry out write processing after stopping the count operation through the setting of the START bit
in RCR2.
RHRCNT is not initialized by a power-on reset or manual reset, or in deep standby and software
standby modes.
Bit: 7
—
Initial value: 0
R/W: R
6
5
4
3
2
1
0
— 10 hours
1 hour
0 ——————
R R/W R/W R/W R/W R/W R/W
Bit Bit Name
7, 6 
5, 4 10 hours
3 to 0 1 hour
Initial
Value
R/W
All 0
R
Undefined R/W
Undefined R/W
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
Counting Ten's Position of Hours
Counts on 0 to 2 for ten's position of hours.
Counting One's Position of Hours
Counts on 0 to 9 once per hour. When a carry is
generated, 1 is added to the ten's position.
Rev. 2.00 Sep. 07, 2007 Page 645 of 1312
REJ09B0320-0200