AT73C224-F_14 Datasheet, PDF (46/75 Pages) ATMEL Corporation – Ultra-low Power Real-time Clock (RTC) and Backup Battery Management

The four Date writing registers are only writable concomitantly and must be written in the order as shown below:
1. RT_CENT
2. RT_YEAR
3. RT_MONTH
4. RT_DATE
6.4.7 Real-time Century Register
Register Name:
RT_CENT
Access Type:
Read/Write
Address:
0x4C
7
6
5
4
3
2
1
0
–
–
CENT
0
1
1
0
0
1
• CENT:
The range is 19 - 20, encoded in BCD. The lowest four bits encode the units, the higher bits encode the tens.
6.4.8 Real-time Year Register
Register Name:
RT_YEAR
Access Type:
Read/Write
Address:
0x4C
7
6
5
4
3
2
1
0
YEAR
1
0
0
1
1
0
0
0
• YEAR:
The range is 1 - 12, encoded in BCD. The lowest four bits encode the units, the higher bits encode the tens.
6.4.9 Real-time Month Register
Register Name:
RT_Month
Access Type:
Read/Write
Address:
0x4E
7
6
5
4
3
2
1
0
DAY
MONTH
1
0
0
0
0
0
0
1
• MONTH:
The range is 1 - 12, encoded in BCD. The lowest four bits encode the units, the higher bits encode the tens.
• DAY:
The range is 1-7 and represents the day of the week. The relationship between the coding of this field and the actual day of
the week, is user-defined. Especially, writing to this bit has no effect on the date counter.
46 AT73C224
6266A–PMAAC–08-Sep-08