Datasheet

Section 11 Realtime Clock (RTC)
Rev.7.00 Dec. 24, 2008 Page 353 of 698
REJ09B0074-0700
11.3.4 Day-of-Week Data Register (RWKDR)
RWKDR counts the BCD-coded day-of-week value on the carry generated once per day by
RHRDR. This register is initialized to H'00 by a STBY input or the RST bit in RTCCR1, but not
initialized by a RES input. 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)
Note: * Initial value after RES.