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8.2.3. Day counter (Reg 3)
Address
Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
3
Days
W4 W2 W1
• The day counter is a divide-by-7 counter that counts from 00 to 01 and up 06 before starting again from 01.
• The correspondence between days and count values is shown below.
Days W4 W2 W1 Day Remark
Write / Read
0 0 0 Sunday 00 h
0 0 1 Monday 01 h
0 1 0 Tuesday 02 h
0 1 1 Wednesday
03 h
1 0 0 Thursday 04 h
1 0 1 Friday 05 h
1 1 0 Saturday 06 h
Write prohibit 1 1 1
−
Do not enter a setting for this bit.
8.2.4. Calendar counter (Reg 4 to 6)
Address
Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
4
Days
D20 D10 D8 D4 D2 D1
5
Months C
MO10
MO8 MO4 MO2 MO1
6
Years Y80 Y40 Y20 Y10 Y8 Y4 Y2 Y1
• The auto calendar function updates all dates, months, and years from January 1, 2001 to December 31, 2099.
• The data format is BCD format. For example, a date register value of "0011 0001" indicates the 31st.
∗ Note with caution that writing non-existent date data may interfere with normal operation of the calendar counter.
1) Date counter
Address
Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
4 Days
D20 D10 D8 D4 D2 D1
• The updating of dates by the date counter varies according to the month setting.
∗ A leap year is set whenever the year value is a multiple of four (such as 04, 08, 12, 88, 92, or 96).
Days Month Date update pattern
Write / Read
1, 3, 5, 7, 8, 10, or 12 01, 02, 03 to 30, 31, 01…
4, 6, 9, or 11 01, 02, 03 to 30, 01, 02…
February in leap year 01, 02, 03 to 28, 29, 01…
February in normal year 01, 02, 03 to 28, 01, 02…
2) Month counter
Address
Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
5 Months C
MO10
MO8 MO4 MO2 MO1
• The month counter counts from 01 (January), 02 (February), and up to 12 (December), then starts again at
01 (January).
∗ Be sure to set a "0" for any bit whose value is shown above as "0". A zero is returned when any of these
bits is read.
∗ When an years counter is updated to 00 from 99, a C bit is updated to 1 from 0.
C is not updated in 0 from 1.
3) Year counter
Address
Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
6 Years Y80 Y40 Y20 Y10 Y8 Y4 Y2 Y1
• The year counter counts from 00, 01, 02 and up to 99, then starts again at 00.
∗ In any year that is a multiple of four (04, 08, 12, 88, 92, 96, etc.), the dates in February are counted from
01, 02, 03 and up to 29 before starting again at 01.
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