Max6901, Wire serial rtc in a tdfn, Table 2. register address/definition – Rainbow Electronics MAX6901 User Manual
Page 6
MAX6901
then read the Seconds register again (final-seconds).
Check to see that final-seconds is equal to initial-sec-
onds. If not, repeat the write process. If the Seconds
register is to be written, update the Seconds register
first, and then read it back and store its value (initial-
seconds). Update the remaining timekeeping registers
and then read the Seconds register again (final-sec-
3-Wire Serial RTC in a TDFN
6
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Table 2. Register Address/Definition
REGISTER ADDRESS
REGISTER DEFINITION
FUNCTION
A7 A6 A5 A4 A3 A2 A1 A0
VALUE
D7
D6 D5 D4
D3
D2 D1
D0
TIMEKEEPING
00-59
32kHz
EN
10 SEC
1 SEC
SECOND
1
0
0
0
0
0
0
RD
/W
*POR STATE
0
0
0
0
0
0
0
0
00-59
ALM
OUT
10 MIN
1 MIN
MINUTE
1
0
0
0
0
0
1
RD
/W
*POR STATE
0
0
0
0
0
0
0
0
00-23
12/24
10
HR
HOUR
1
0
0
0
0
1
0
RD
/W
01-12
1/0
0
A/P
0/1
10
HR
1 HR
*POR STATE
0
0
0
0
0
0
0
0
01-28/29
01-30
01-31
0
0
10 DATE
1 DATE
DATE
1
0
0
0
0
1
1
RD
/W
*POR STATE
0
0
0
0
0
0
0
1
01-12
0
0
0
10M
1 MONTH
MONTH
1
0
0
0
1
0
0
RD
/W
*POR STATE
0
0
0
0
0
0
0
1
01-07
0
0
0
0
0
WEEKDAY
DAY
1
0
0
0
1
0
1
RD
/W
*POR STATE
0
0
0
0
0
0
0
1
00-99
10 YEAR
1 YEAR
YEAR
1
0
0
0
1
1
0
RD
/W
*POR STATE
0
1
1
1
0
0
0
0
WP
0
0
0
0
0
0
0
CONTROL
1
0
0
0
1
1
1
RD
/W
*POR STATE
0
0
0
0
0
0
0
0
00-99
1000 YEAR
100 YEAR
CENTURY
1
0
0
1
0
0
1
RD
/W
*POR STATE
0
0
0
1
1
0
0
1
Note: *POR STATE defines power-on reset state of register content.