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M41T81 Datasheet(PDF) 14 Page - STMicroelectronics |
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M41T81 Datasheet(HTML) 14 Page - STMicroelectronics |
14 / 30 page Clock operation M41T81 14/30 Table 2. Clock register map(1) Addr Function/range BCD format D7 D6 D5 D4 D3 D2 D1 D0 00h 0.1 seconds 0.01 seconds 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 FT S Calibration Control 09h 0 BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0 Watchdog 0Ah AFE SQWE ABE Al 10M Alarm month Al month 01-12 0Bh RPT4 RPT5 AI 10 date Alarm date Al date 01-31 0Ch RPT3 HT 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 0Fh WDF AF 0 0 0 0 0 0 Flags 10h 0 0 0 0 0 0 0 0 Reserved 11h 0 0 0 0 0 0 0 0 Reserved 12h 0 0 0 0 0 0 0 0 Reserved 13h RS3 RS2 RS1 RS0 0 0 0 0 SQW 1. Keys: S = Sign Bit FT = Frequency Test Bit ST = Stop Bit 0 = Must be set to '0' BMB0-BMB4 = Watchdog Multiplier Bits CEB = Century Enable Bit CB = Century Bit OUT = Output level ABE = Alarm in Battery Back-up Mode Enable Bit AFE = Alarm Flag Enable Flag RB0-RB1 = Watchdog Resolution Bits 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 |
Similar Part No. - M41T81_06 |
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Similar Description - M41T81_06 |
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