M4T28-BR12SH ST Microelectronics, M4T28-BR12SH Datasheet - Page 18

• Manufacturer Part Number: M4T28-BR12SH
• Description: TIMEKEEPER SNAPHAT Battery & Crystal
• Manufacturer: ST Microelectronics

M41ST85Y, M41ST85W
Table 8. TIMEKEEPER
Keys: S = Sign Bit
18/33
Address
0Ch
0Dh
0Ah
0Bh
0Eh
0Fh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
10h
12h
13h
11h
FT = Frequency Test Bit
ST = Stop Bit
0 = Must be set to zero
BL = Battery Low Flag (Read only)
BMB0-BMB4 = Watchdog Multiplier Bits
CEB = Century Enable Bit
CB = Century Bit
OUT = Output level
AFE = Alarm Flag Enable Flag
RPT4
RPT3
RPT2
RPT1
WDS
WDF
OUT
CEB
AFE
RS3
D7
ST
TR
0
0
0
0
0
0
SQWE
BMB4
RPT5
RS2
CB
D6
0.1 Seconds
HT
AF
FT
0
0
0
0
0
0
Alarm 10 Seconds
10 Years
Alarm 10 Minutes
®
Register Map
10 Seconds
10 Minutes
BMB3
ABE
RS1
D5
S
0
0
AI 10 Date
AI 10 Hour
0
0
0
0
10 Hours
10 Date
Al 10M
BMB2
10M
RS0
D4
BL
0
0
0
0
Data
BMB1
D3
0
0
0
0
0
0
Hours (24 Hour Format)
Calibration
Date: Day of Month
BMB0
Alarm Seconds
Alarm Minutes
0.01 Seconds
Alarm Month
D2
Alarm Hour
Alarm Date
0
0
0
0
0
Seconds
Minutes
Month
Year
Day of Week
RB0-RB1 = Watchdog Resolution Bits
WDS = Watchdog Steering Bit
ABE = Alarm in Battery Back-Up Mode Enable Bit
RPT1-RPT5 = Alarm Repeat Mode Bits
WDF = Watchdog flag (Read only)
AF = Alarm flag (Read only)
SQWE = Square Wave Enable
RS0-RS3 = SQW Frequency
HT = Halt Update Bit
TR = t
RB1
D1
0
0
0
0
0
REC
Bit
RB0
D0
0
0
0
0
0
Century/Hours
Watchdog
Reserved
Reserved
Reserved
Al Month
Seconds
Seconds
Minutes
Al Hour
Control
Al Date
Al Sec
Month
Al Min
SQW
Date
Flags
Year
Day
Function/Range
BCD Format
0-1/00-23
00-99
00-59
00-59
01-31
01-12
00-99
01-12
01-31
00-23
00-59
00-59
01-7