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X1243 Datasheet(PDF) 4 Page - Intersil Corporation |
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X1243 Datasheet(HTML) 4 Page - Intersil Corporation |
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4 / 17 page  4 FN8249.0 April 28, 2005 Real Time Clock Registers Year 2000 (Y2K) The X1243 has a century byte that “rolls over” from 19 to 20 when the years byte changes from 99 to 00. The Y2K byte can contain only the values of 19 or 20. Day of the Week Register (DW) This register provides a Day of the Week status and uses three bits DY2 to DY0 to represent the seven days of the week. The counter advances in the cycle 0-1-2-3-4-5-6-0-1- 2-... The assignment of a numerical value to a specic day of the week is arbitrary and may be decided by the system software designer. The Clock Default values dene 0 = Sunday. Clock/Calendar Registers (YR, MO, DT, HR, MN, SC) These registers depict BCD representations of the time. As such, SC (Seconds) and MN (Minutes) range from 00 to 59, HR (Hour) is 1 to 12 with an AM or PM indicator (H21 bit) or 0 to 23 (with T24 = 1), DT (Date) is 1 to 31, MO (Month) is 1 to 12, YR (year) is 0 to 99. TABLE 1. CLOCK/CONTROL MEMORY MAP ADDR. TYPE REG NAME BIT RANGE FACTORY SETTINGS 7 6 5 4 3 2 1 0 OPTIONAL 003F Status SR BAT AL1 AL0 0 0 RWEL WEL RTCF 01h 0037 RTC (SRAM) Y2K 0 0 Y2K21 Y2K20 Y2K13 0 0 Y2K10 19/20 20h 0036 DW 0 0 0 0 0 DY2 DY1 DY0 0-6 00h 0035 YR Y23 Y22 Y21 Y20 Y13 Y12 Y11 Y10 0-99 00h 0034 MO 0 0 0 G20 G13 G12 G11 G10 1-12 00h 0033 DT 0 0 D21 D20 D13 D12 D11 D10 1-31 00h 0032 HR T24 0 H21 H20 H13 H12 H11 H10 0-23 00h 0031 MN 0 M22 M21 M20 M13 M12 M11 M10 0-59 00h 0030 SC 0 S22 S21 S20 S13 S12 S11 S10 0-59 00h 0011 Control (EEPROM) INT IM AL1E AL0E 0 0 0 0 0 00h 0010 BL BP2 BP1 BP0 0 0 0 0 0 00h 000F Alarm1 (EEPROM) unused 000E DWA1 EDW1 0 0 0 0 DY2 DY1 DY0 0-6 00h 000D YRA1 Unused - Default = RTC Year value 000C MOA1 EMO1 0 0 A1G20 A1G13 A1G12 A1G11 A1G10 1-12 00h 000B DTA1 EDT1 0 A1D21 A1D20 A1D13 A1D12 A1D11 A1D10 1-31 00h 000A HRA1 EHR1 0 A1H21 A1H20 A1H13 A1H12 A1H11 A1H10 0-23 00h 0009 MNA1 EMN1 A1M22 A1M21 A1M20 A1M13 A1M12 A1M11 A1M10 0-59 00h 0008 SCA1 ESC1 A1S22 A1S21 A1S20 A1S13 A1S12 A1S11 A1S10 0-59 00h 0007 Alarm0 (EEPROM) unused 0006 DWA1 EDW0 0 0 0 0 DY2 DY1 DY0 0-6 00h 0005 YRA0 Unused - Default = RTC Year value 0004 MOA0 EMO0 0 0 A0G20 A0G13 A0G12 A0G11 A0G10 1-12 00h 0003 DTA0 EDT0 0 A0D21 A0D20 A0D13 A0D12 A0D11 A0D10 1-31 00h 0002 HRA0 EHR0 0 A0H21 A0H20 A0H13 A0H12 A0H11 A0H10 0-23 00h 0001 MNA0 EMN0 A0M22 A0M21 A0M20 A0M13 A0M12 A0M11 A0M10 0-59 00h 0000 SCA0 ESC0 A0S22 A0S21 A0S20 A0S13 A0S12 A0S11 A0S10 0-59 00h X1243 |
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