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DS1921 Datasheet(PDF) 6 Page - Dallas Semiconductor |
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DS1921 Datasheet(HTML) 6 Page - Dallas Semiconductor |
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6 / 44 page  DS1921H/Z 6 of 44 DS1921H/Z REGISTER PAGE MAP Figure 6 ADDR b7 b6 b5 b4 b3 b2 b1 b0 Function Access* 0200h 0 10 Seconds Single Seconds 0201h 0 10 Minutes Single Minutes Real- 0202h 0 12/24 20h. AM/PM 10h. Single Hours Time Clock R/W; R/W** 0203h 0 0 0 0 0 Day of Week Registers 0204h 0 0 10 Date Single Date 0205h CENT 0 0 10m. Single Months 0206h 10 Years Single Years 0207h MS 10 Seconds Alarm Single Seconds Alarm Real- 0208h MM 10 Minutes Alarm Single Minutes Alarm Time 0209h MH 12/24 10ha. A/P 10h. alm. Single Hours Alarm Clock Alarm R/W; R/W** 020Ah MD 0 0 0 0 Day of Week Alarm Registers 020Bh Temperature Low Alarm Threshold Temp. R/W; R/W** 020Ch Temperature High Alarm Threshold Alarms 020Dh Number of Minutes Between Temperature Conversions Sample Rate R/W; R** 020Eh EOSC EMCLR 0 EM RO TLS THS TAS Control R/W; R/W** 020Fh (no function, reads 00h) (N/A) R; R** 0210h (no function, reads 00h) (N/A) R; R** 0211h Temperature Read Out (Forced Conversion) Temp. R; R** 0212h Low Byte Start R/W; R/W** 0213h High Byte Delay 0214h TCB MEMCLR MIP SIP 0 TLF THF TAF Status R/W; R/W 0215h Minutes 0216h Hours Mission 0217h Date Time R; R 0218h Month Stamp 0219h Year 021Ah Low Byte Mission 021Bh Center Byte Samples R; R 021Ch High Byte Counter 021Dh Low Byte Device 021Eh Center Byte Samples R; R 021Fh High Byte Counter *The first entry in column ACCESS is valid between missions. The second entry shows the applicable access mode while a mission is in progress. **While a mission is in progress, these addresses can be read. The first attempt to write to these registers (even read-only ones), however, will end the mission and overwrite selected writeable registers. TIMEKEEPING The RTC/alarm and calendar information is accessed by reading/writing the appropriate bytes in the register page, address 200h to 206h. Note that some bits are set to 0. These bits will always read 0 regardless of how they are written. The contents of the time, calendar, and alarm registers are in the Binary-Coded Decimal (BCD) format. |
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