Datasheet

Section 10 Realtime Clock (RTC)
Rev. 3.00 Sep. 10, 2007 Page 171 of 528
REJ09B0216-0300
10.3.3 Hour Data Register (RHRDR)
RHRDR counts the BCD-coded hour value on the carry generated once per hour by RMINDR.
The setting range is either decimal 00 to 11 or 00 to 23 by the selection of the 12/24 bit in
RTCCR1.
Bit Bit Name
Initial
Value
R/W Description
7 BSY — R RTC Busy
This bit is set to 1 when the RTC is updating (operating)
the values of second, minute, hour, and day-of-week
data registers. When this bit is 0, the values of second,
minute, hour, and day-of-week data registers must be
adopted.
6 — 0 — Reserved
This bit is always read as 0.
5
4
HR11
HR10
—
—
R/W
R/W
Counting Ten's Position of Hours
Counts on 0 to 2 for ten's position of hours.
3
2
1
0
HR03
HR02
HR01
HR00
—
—
—
—
R/W
R/W
R/W
R/W
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.