Datasheet

Clock operation M41T80
14/27 Doc ID 9074 Rev 5
Table 3. Clock register map
(1)
1. Keys:
ST = Stop bit
0 = Must be set to '0'
32KE = Enable bit for 32 KHz output
CEB = Enable for century bit
CB = Century bit
OUT = Data bit for OUT pin
AFE = Alarm flag enable bit
RPT1-RPT5 = Alarm repeat mode bits
AF = Alarm flag (read only)
SQWE = Square wave enable
RS0-RS3 = SQW frequency select
Addr
Function/range BCD
format
D7 D6 D5 D4 D3 D2 D1 D0
00h 0.1 seconds 0.01 seconds
10s/100s
of seconds
00-99
01h ST 10 seconds Seconds Seconds 00-59
02h 0 10 minutes Minutes Minutes 00-59
03h CEB CB 10 hours Hours (24-hour format)
Century/
hours
0-1/00-23
04h 0 0 0 0 0 Day of week Day 01-7
05h 0 0 10 date Date: day of month Date 01-31
06h 0 0 0 10M Month Month 01-12
07h 10 years Year Year 00-99
08h OUT 0 0 0 0 0 0 0 Control
09h 32KE 0 0 0 0 0 0 0 32 KHz
0Ah AFE SQWE 0 Al 10M Alarm month Al month 01-12
0Bh RPT4 RPT5 AI 10 date Alarm date Al date 01-31
0Ch RPT3 0 AI 10 hour Alarm hour Al hour 00-23
0Dh RPT2 Alarm 10 minutes Alarm minutes Al min 00-59
0Eh RPT1 Alarm 10 seconds Alarm seconds Al sec 00-59
0Fh0AF0 0 0000 Flags
10h00000000Reserved
11h00000000Reserved
12h00000000Reserved
13h RS3 RS2 RS1 RS0 0 0 0 0 SQW