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DS1556-70IND+ Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS1556-70IND+ Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 18 page DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM 6 of 18 CLOCK OPERATIONS Table 2 and the following paragraphs describe the operation of RTC, alarm, and watchdog functions. Table 2. Register Map DATA ADDRESS B7 B6 B5 B4 B3 B2 B1 B0 FUNCTION RANGE 1FFFFh 10 Year Year Year 00-99 1FFFEh X X X 10 Month Month Month 01-12 1FFFDh X X 10 Date Date Date 01-31 1FFFCh X Ft X X X Day Day 01-07 1FFFBh X X 10 Hour Hour Hour 00-23 1FFFAh X 10 Minutes Minutes Minutes 00-59 1FFF9h OSC 10 Seconds Seconds Seconds 00-59 1FFF8h W R 10 Century Century Control 00-39 1FFF7h WDS BMB4 BMB3 BMB2 BMB1 BMB0 RB1 RB0 Watchdog 1FFF6h AE Y ABE Y Y Y Y Y Interrupts 1FFF5h AM4 Y 10 Date Date Alarm Date 01-31 1FFF4h AM3 Y 10 Hours Hours Alarm Hours 00-23 1FFF3h AM2 10 Minutes Minutes Alarm Minutes 00-59 1FFF2h AM1 10 Seconds Seconds Alarm Seconds 00-59 1FFF1h Y Y Y Y Y Y Y Y Unused 1FFF0h WF AF 0 BLF 0 0 0 0 Flags X = Unused, Read/Writable Under Write and Read Bit Control AE = Alarm Flag Enable Y = Unused, Read/Writable Without Write and Read Bit Control ABE = Alarm in Battery-Backup Mode Enable FT = Frequency Test Bit AM1 to AM4 = Alarm Mask Bits OSC = Oscillator Start/Stop Bit WF = Watchdog Flag W = Write Bit AF = Alarm Flag R = Read Bit 0 = 0 (Read Only) WDS = Watchdog Steering Bit BLF = Battery Low Flag BMB0 to BMB4 = Watchdog Multiplier Bits RB0 to RB1 = Watchdog Resolution Bits CLOCK OSCILLATOR CONTROL The clock oscillator can be stopped at any time. To increase the shelf life of the backup lithium battery source, the oscillator can be turned off to minimize current drain from the battery. The OSC bit is the MSB of the Seconds Register (B7 of 1FFF9h). Setting it to a 1 stops the oscillator, setting to a 0 starts the oscillator. The DS1556 is shipped from Maxim with the clock oscillator turned off, OSC bit set to a 1. |
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