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HMNR28DV-85I Datasheet(PDF) 10 Page - Hanbit Electronics Co.,Ltd |
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HMNR28DV-85I Datasheet(HTML) 10 Page - Hanbit Electronics Co.,Ltd |
10 / 13 page HANBit HMNR28D(V) URL : www.hbe.co.kr 10 HANBit Electronics Co.,Ltd. Rev. 0.0 (March, 2002) Register Map Data Address D7 D6 D5 D4 D3 D2 D1 D0 Funtion / Range BCD Format 7FF 10Years Year Year 00-99 7FE 0 0 0 10M Month Month 01-12 7FD 0 0 10 Date Date : Day of Month Date 01-31 7FC 0 FT 0 0 0 Day Day 01-07 7FB 0 0 10 Hours Hours(24 Hour Format) Hours 00-23 7FA 0 10 Minutes Minutes Minutes 00-59 7F9 ST 10 Seconds Seconds Seconds 00-59 7F8 W R S Calibration Control 7F7 0 0 0 0 0 0 0 0 7F6 0 0 0 0 0 0 0 0 7F5 0 0 0 0 0 0 0 0 7F4 0 0 0 0 0 0 0 0 7F3 0 0 0 0 0 0 0 0 7F2 0 0 0 0 0 0 0 0 7F1 1000 Years 100 Years Century 00-99 7F0 0 0 0 BL 0 0 0 0 Flag Keys : R = READ Bit W = WRITE Bit ST = Stop Bit 0 = Must be set to ’0’ BL = Battery Low Flag S = Sign Bit CLOCK OPERATIONS The HMNR28D(V) offers 16 internal registers which contain TIMEKEEPER, and Control data. These registers are memory locations which contain external (user accessible) and internal copies of the data. The external copies are independent of internal functions except that they are updated periodically by the simultaneous transfer of the incremented internal copy. TIMEKEEPER Registers store data in BCD. Control Registers store data in Binary Format. Reading the Clock Updates to the TIMEKEEPER registers should be halted before clock data is read to prevent reading data in transition. The TIMEKEEPER cells in the RAM array are only data registers and not the actual clock counters, so updating the registers can be halted without disturbing the clock itself. Updating is halted when a ’1’is written to the READ Bit, D6 in the Control Register (7F8h). 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 time that were current at the moment the halt command was is-sued. All of the TIMEKEEPER registers are updated simultaneously. A halt will not interrupt an update in progress. Updating occurs approximately 1 second after the READ Bit is reset to a ’0.’ |
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