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M48T36 Datasheet(PDF) 10 Page - STMicroelectronics |
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M48T36 Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 17 page  Updating is halted when a ’1’ is written to the READ bit, D6 in the Control Register 7FF8h. As long as a ’1’ remains in that position, updating is halted. After a halt is issued, the registers reflect the count; that is, the day, date, and the time that were current at the moment the halt command was issued. All of the TIMEKEEPER registers are updated si- multaneously. A halt will not interrupt an update in progress. Updating is within a second after the bit is reset to a ’0’. Setting the Clock Bit D7 of the Control Register 7FF8h is the WRITE bit. Setting the WRITE bit to a ’1’, like the READ bit, halts updates to the TIMEKEEPER registers. The user can then load them with the correct day, date, and time data in 24 hour BCD format (see Table 10). Resetting the WRITE bit to a ’0’ then transfers the values of all time registers 7FF9h-7FFFh to the actual TIMEKEEPER counters and allows normal operation to resume. After the WRITE bit is reset, the next clock update will occur in one second. Stopping and Starting the Oscillator The oscillator may be stopped at any time. If the device is going to spend a significant amount of time on the shelf, the oscillator can be turned off to minimize current drain on the battery. The STOP bit is the MSB of the seconds register. Setting it to a ’1’ stops the oscillator. The M48T36 is shipped from SGS-THOMSON with the STOP bit set to a ’1’. Address Data Function/Ran ge BCD Format D7 D6 D5 D4 D3 D2 D1 D0 7FFFh 10 Years Year Year 00-99 7FFEh 0 0 0 10 M. Month Month 01-12 7FFDh 0 0 10 Date Date Date 01-31 7FFCh 0 FT 0 0 0 Day Day 01-07 7FFBh 0 0 10 Hours Hours Hour 00-23 7FFAh 0 10 Minutes Minutes Minutes 00-59 7FF9h ST 10 Seconds Seconds Seconds 00-59 7FF8h W R S Calibration Control 7FF7h WDS BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0 Watchdog 7FF6h AFE Y ABE YYYYY Interrupts 7FF5h RPT4 Y Al. 10 Date Alarm Date Alarm Date 01-31 7FF4h RPT3 Y Al. 10 Hours Alarm Hours Alarm Hours 00-23 7FF3h RPT2 Alarm 10 Minutes Alarm Minutes Alarm Minutes 00-59 7FF2h RPT1 Alarm 10 Seconds Alarm Seconds Alarm Seconds 00-59 7FF1h Y Y Y YYYYY Unused 7FF0h WDF AF Z BL Z Z Z Z Flags Table 10. Register Map Keys: S = SIGN Bit FT = FREQUENCY TEST Bit R = READ Bit W = WRITE Bit ST = STOP Bit 0 = Must be set to ’0’ Y = ’1’ or ’0’ Z = ’0’ and are Read only AF = Alarm Flag BL = Battery Low WDS = Watchdog Steering Bit BMB0–BMB4 = Watchdog Multiplier Bits RB0–RB1 = Watchdog Resolution Bits AFE = Alarm Flag Enable ABE = Alarm in Battery Back-up Mode Enable RPT1–RPT4 = Alarm Repeat Mode Bits WDF = Watchdog Flag CLOCK OPERATIONS (cont’d) 10/17 M48T36 |
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