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FM3135 Datasheet(PDF) 8 Page - Ramtron International Corporation |
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FM3135 Datasheet(HTML) 8 Page - Ramtron International Corporation |
8 / 21 page FM3135 Integrated RTC/Alarm/FRAM & Embedded Crystal Rev. 1.2 Feb. 2009 Page 8 of 21 Register Map The RTC, alarm, and other functions are accessed via 15 special function registers mapped to a separate 2-wire device ID. The interface protocol is described below. The registers contain timekeeping data, control bits, or information flags. A description of each register follows the summary table below. Register Map Summary Table Address D7 D6 D5 D4 D3 D2 D1 D0 Function Range 0Eh AL/SW F1 F0 WP1 WP0 VBC FC TST Alarm & WP Control 0Dh /Match 0 0 10 mo Alarm months Alarm Month 01-12 0Ch /Match 0 10 date Alarm date Alarm Date 01-31 0Bh /Match 0 Alarm 10 hours Alarm hours Alarm Hours 00-23 0Ah /Match Alarm 10 minutes Alarm minutes Alarm Minutes 00-59 09h /Match Alarm 10 seconds Alarm seconds Alarm Seconds 00-59 08h 10 years years RTC Years 00-99 07h 00 0 10 mo months RTC Month 1-12 06h 00 10 date date RTC Date 1-31 05h 00 00 0 day RTC Day 1-7 04h 00 10 hours hours RTC Hours 0-23 03h 0 10 minutes minutes RTC Minutes 0-59 02h 0 10 seconds seconds RTC Seconds 0-59 01h /OSCEN - CALS CAL4 CAL3 CAL2 CAL1 CAL0 CAL/Control 00h LB AF CF POR AEN CAL W R RTC/Alarm Control Note: When the device is first powered up, all registers should be treated as unknown and must be written. Otherwise, unpredictable behavior may result. |
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