Datasheet

Section 10 Realtime Clock (RTC)
Rev. 2.00 Sep. 23, 2005 Page 146 of 472
REJ09B0160-0200
10.3.4 Day-of-Week Data Register (RWKDR)
RWKDR counts the BCD-coded day-of-week value on the carry generated once per day by
RHRDR. The setting range is decimal 0 to 6 using bits WK2 to WK0.
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 to 3 — All 0 — Reserved
These bits are always read as 0.
2
1
0
WK2
WK1
WK0
—
—
—
R/W
R/W
R/W
Day-of-week counting
Day-of-week is indicated with a binary code
000: Sunday
001: Monday
010: Tuesday
011: Wednesday
100: Thursday
101: Friday
110: Saturday
111: Reserved (setting prohibited)