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DS1553W-150+ Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS1553W-150+ Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 20 page DS1553 64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM 6 of 20 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 1FFFh 10 Year Year Year 00-99 1FFEh X X X 10 M Month Month 01-12 1FFDh X X 10 Date Date Date 01-31 1FFCh X FT X X X Day Day 01-07 1FFBh X X 10 Hour Hour Hour 00-23 1FFAh X 10 Minutes Minutes Minutes 00-59 1FF9h OSC 10 Seconds Seconds Seconds 00-59 1FF8h W R 10 Century Century Control 00-39 1FF7h WDS BMB 4 BMB3 BMB2 BMB 1 BMB 0 RB 1 RB0 Watchdog 1FF6h AE Y ABE Y Y Y Y Y Interrupts 1FF5h AM4 Y 10 Date Date Alarm Date 01-31 1FF4h AM3 Y 10 Hours Hours Alarm Hours 00-23 1FF3h AM2 10 Minutes Minutes Alarm Minutes 00-59 1FF2h AM1 10 Seconds Seconds Alarm Seconds 00-59 1FF1h Y Y Y Y Y Y Y Y Unused — 1FF0h WF AF 0 BLF 0 0 0 0 Flags — X = Unused, Read/Writable Under Write and Read Bit Control AE = Alarm Flag Enable FT = Frequency Test Bit Y = Unused, Read/Writable Without Write and Read Bit Control OSC = Oscillator Start/Stop Bit ABE = Alarm in Battery-Backup Mode Enable W = Write Bit AM1–AM4 = Alarm Mask Bits R = Read Bit WF = Watchdog Flag WDS = Watchdog Steering Bit AF = Alarm Flag BMB0–BMB4 = Watchdog Multiplier Bits 0 = 0 Read Only RB0–RB1 = Watchdog Resolution Bits BLF = Battery Low Flag CLOCK OSCILLATOR CONTROL The clock oscillator may 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 1FF9h). Setting it to 1 stops the oscillator; setting it to 0 starts the oscillator. The DS1553 is shipped from Dallas Semiconductor with the clock oscillator turned off, with the OSC bit set to 1. |
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