SH7205 Datasheet, PDF (738/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 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.
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. 1.00 Mar. 25, 2008 Page 706 of 1868
REJ09B0372-0100