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RX − 8564 LC
Page − 15
ETM12E-01
13.1.4. Calendar counter ( Reg − 05 [h] , 07 [h] , 08 [h] )
Address [h]
Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
05 Days
× ×
20 10 8 4 2 1
07 Months / Century C
× ×
10 8 4 2 1
08 Years 80 40 20 10 8 4 2 1
• 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) [
Day
] register ( Reg − 05 [h] )
• This is the date counter.
Updating of this counter varies depending on the month.
∗ A leap year is set whenever the year value is a multiple of four (such as 04, 08, 12, 88, 92, or 96). In
February of a leap year, the counter counts dates from "01," "02," "03," to "28," "29," "01," etc.
[ Days ]
Month Date update pattern
1, 3, 5, 7, 8, 10, or 12
01, 02, 03 ∼ 30, 31, 01 ∼
4, 6, 9, or 11
01, 02, 03 ∼ 30, 01, 02 ∼
February in normal year
01, 02, 03 ∼ 28, 01, 02 ∼
Write / Read
February in leap year
01, 02, 03 ∼ 28, 29, 01 ∼
2) [
Months / Century
] register ( Reg − 07 [h] )
• This is the month counter.
It is updated in annual cycles of regularly ordered months (January, February, March, etc.).
3) [ YEAR ] register ( Reg − 08 [h] )
• This is the year counter.
It is updated in 100-year cycles of regularly ordered years (00, 01, 02 to 99, etc.).
∗ Any year that is a multiple of four (04, 08, 12, 88, 92, 96, etc.) is handled as a leap year.
4) C bit ( Century bit )
• This bit indicates change of century.
∗ When the year digit data overflows from 99 to 00, this bit is set. By presetting it to 0 while still in the 20th
century, it will be set in year 2000, but in fact the first year in the 21 century should be 2001.
13.1.5. Day counter ( Reg − 6[h] )
Address [h]
Function bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
06 Weekdays
× × × × ×
4 2 1
• The day (of the week) is indicated by 3 bits, bit 0 to bit 2.
[
Weekdays
]
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 Day
× × × × ×
0 0 0 Sunday
× × × × ×
0 0 1 Monday
× × × × ×
0 1 0 Tuesday
× × × × ×
0 1 1 Wednesday
× × × × ×
1 0 0 Thursday
× × × × ×
1 0 1 Friday
Write / Read
× × × × ×
1 1 0 Saturday
∗ Note with caution that any settings other than the seven listed above may prevent normal operation.