DS17885 Dallas, DS17885 Datasheet - Page 20

• Manufacturer Part Number: DS17885
• Description: (DS17886 / DS17887) 3V/5V Real-Time Clock
• Manufacturer: Dallas

Figure 4. DS17885/DS17887 EXTENDED REGISTER BANK DEFINITION
0D
0E
3F
7F
00
40
MSB
TIMEKEEPING AND CONTROL
50 BYTES - USER RAM
64 BYTES - USER RAM
BANK 0
DV0 = 0
LSB
0D
4C
4D
5C
5D
0E
3F
4A
4B
4E
4F
5A
5B
5E
5F
7F
00
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
MSB
20 of 38
EXTENDED CONTROL REG 4A
EXTENDED CONTROL REG 4B
TIMEKEEPING AND CONTROL
EXTENDED RAM ADDR - MSB
EXTENDED RAM DATA PORT
EXTENDED RAM ADDR - LSB
2ND BYTE SERIAL NUMBER
3RD BYTE SERIAL NUMBER
1ST BYTE SERIAL NUMBER
4TH BYTE SERIAL NUMBER
5TH BYTE SERIAL NUMBER
6TH BYTE SERIAL NUMBER
MODEL NUMBER BYTE
50 BYTES - USER RAM
RTC WRITE COUNTER
RTC ADDRESS - 2
RTC ADDRESS - 3
CENTURY BYTE
DATE ALARM
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
RESERVED
CRC BYTE
BANK 1
DV0 = 1
LSB
EXTENDED
8k X 8
RAM