MAX6901 查看數據表（PDF） - Maxim Integrated
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MAX6901 Datasheet PDF : 18 Pages
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3-Wire Serial RTC in a TDFN
Table 2. Register Address/Definition
REGISTER ADDRESS
FUNCTION A7 A6 A5 A4 A3 A2 A1 A0
TIMEKEEPING
SECOND
1000
RD
0 0 0 /W
MINUTE
1
000
RD
0 0 1 /W
HOUR
1000
RD
0 1 0 /W
DATE
1
000
RD
0 1 1 /W
MONTH
1000
RD
1 0 0 /W
VALUE
REGISTER DEFINITION
D7 D6 D5 D4 D3 D2 D1 D0
00-59
32kHz
EN
10 SEC
*POR STATE 0 0 0 0
1 SEC
0000
00-59
ALM
OUT
10 MIN
1 MIN
*POR STATE 0 0 0 0 0 0 0 0
00-23
01-12
12/24
1/0
0
10
HR 10
A/P HR
0/1
1 HR
*POR STATE 0 0 0 0 0 0 0 0
01-28/29
01-30
01-31
*POR STATE
0 0 10 DATE
1 DATE
0 00 0 0 0 0 1
01-12
*POR STATE
0 0 0 10M
1 MONTH
0 00 0 0 0 0 1
DAY
1
000
RD
1 0 1 /W
01-07 0 0 0 0 0 WEEKDAY
*POR STATE 0 0 0 0 0 0 0 1
YEAR
1
000
RD
1 1 0 /W
00-99
10 YEAR
1 YEAR
*POR STATE 0 1 1 1 0 0 0 0
CONTROL
1
000
RD
1 1 1 /W
WP 0 0 0 0 0 0 0
*POR STATE 0 0 0 0 0 0 0 0
CENTURY
1001
RD
0 0 1 /W
00-99
*POR STATE
1000 YEAR
0 001
100 YEAR
1001
Note: *POR STATE defines power-on reset state of register content.
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-
6 _______________________________________________________________________________________
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