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ISL12008IB8Z Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL12008IB8Z Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 19 page 10 FN6690.1 September 26, 2008 Real Time Clock Registers Addresses [00h to 06h, and 1Fh] RTC REGISTERS (SC, MN, HR, DW, DT, MO, YR, SS) These registers depict BCD representations of the time. As such, SC (Seconds, address 00h) and MN (Minutes, address 01h) range from 0 to 59, HR (Hour, address 02h) is in 24-hour mode with a range from 0 to 23, DW (Day of the Week, address 03h) is 1 to 7, DT (Date, address 04h) is 1 to 31, MO (Month, address 05h) is 1 to 12, YR (Year, address 06h) is 0 to 99, and SS (Sub-Seconds/Hundredths of Seconds, address 1Fh) is 0 to 99. The default for all the time keeping bits are set to “0” at power up. Bit D7 of SC register contain the crystal enable/disable bit (ST). Setting ST to “1” will disable the crystal from oscillating and stop the counting in RTC register. When the ST bit is set to “1”, it will casue the OF bit to set to “1” due to no crystal oscillation on the X1 pin. The ST bit is set to “0” on power-up for normal operation. Bit D7 of MN register contain the Oscillator Fail Indicator bit (OF). This bit is set to a “1” when the X1 pin has no oscillation. This bit can be reset when the X1 has crystal oscillation and a write to “0”. This bit can only be written as “0” and not as a “1”. The OF bit is set to “1” at power-up from a complete power down (VDD and VBAT are removed). Address 9, bit 7 is also used as the OF bit for DS1340 compatibility, and the two OF bits are interchangable. Bits D6 and D7 of HR register (century/hours register) contain the century enable bit (CEB) and the century bit (CB). Setting CEB to a '1' will cause CB to toggle, either from '0' to '1' or from '1' to '0' at the turn of the century (depending upon its initial state). If CEB is set to a '0', CB will not toggle. The DW register provides a Day of the Week status and uses three bits DW2 to DW0 to represent the seven days of the week. The counter advances in the cycle 1-2-3-4-5-6-7-1-2- … The assignment of a numerical value to a specific day of the week is arbitrary and may be decided by the system software designer. TABLE 1. REGISTER MEMORY MAP ADDR. SECTION REG NAME BIT REG 7 6 5 4 3 2 1 0 RTC RANGE DEFAULT 00h RTC SC ST SC22 SC21 SC20 SC13 SC12 SC11 SC10 0 to 59 00h 01h MN OF MN22 MN21 MN20 MN13 MN12 MN11 MN10 0 to 59 80h 02h HR CEB CB HR21 HR20 HR13 HR12 HR11 HR10 0 to 23 00h 03h DW 00000 DW12 DW11 DW10 1 to 7 00h 04h DT 0 0 DT21 DT20 DT13 DT12 DT11 DT10 1 to 31 00h 05h MO 0 0 0 MO20 MO13 MO12 MO11 MO10 1 to 12 00h 06h YR YR23 YR22 YR21 YR20 YR13 YR12 YR11 YR10 0 to 99 00h 07h Control DTR OUT FT DTR5 DTR4 DTR3 DTR2 DTR1 DTR0 N/A 80h 08h INT 0 ALME LPMODE 00000 N/A 00h 09h OF OF 0000000 N/A 80h 0Ah ATR BMATR1 BMATR0 ATR5 ATR4 ATR3 ATR2 ATR1 ATR0 N/A 00h 0Bh Status SR ARST XSTOP RESEAL 0 0 ALM BAT RTCF N/A 03h 0Ch Alarm0 SCA ESCA ASC22 ASC21 ASC20 ASC13 ASC12 ASC11 ASC10 00 to 59 00h 0Dh MNA EMNA AMN22 AMN21 AMN20 AMN13 AMN12 AMN11 AMN10 00 to 59 00h 0Eh HRA EHRA 0 AHR21 AHR20 AHR13 AHR12 AHR11 AHR10 0 to 23 00h 0Fh DTA EDTA 0 ADT21 ADT20 ADT13 ADT12 ADT11 ADT10 1 to 31 00h 10h MOA EMOA 0 0 AMO20 AMO13 AMO12 AMO11 AMO10 1 to 12 00h 11h DWA EDWA 0000 ADW12 ADW11 ADW10 1 to 7 00h 1Fh (Read- Only) RTC SS SS23 SS22 SS21 SS20 SS13 SS12 SS11 SS10 0 to 99 00h NOTE: 0 = must be set to‘0’ ISL12008 |
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