|ISL12020M||Low Power RTC with Battery Backed SRAM,Integrated ±5ppm Temperature Compensation and Auto Daylight Saving|
|ISL12020M Datasheet PDF : 32 Pages |
TABLE 1. REGISTER MEMORY MAP (Continued)(X INDICATES DEFAULT VARIES WITH EACH DEVICE. YELLOW
SHADING INDICATES THOSE BITS SHOULD NOT BE CHANGED BY THE USER) (Continued)
ADDR. SECTION NAME
DstMoFd20 DstMoFd13 DstMoFd12 DstMoFd11 DstMoFd10 1 to 12
DstDwFdE DstWkFd12 DstWkFd11 DstWkFd10 DstDwFd12 DstDwFd11 DstDwFd10 0 to 6
DstDtFd21 DstDtFd20 DstDtFd13 DstDtFd12 DstDtFd11 DstDtFd10 1 to 31
24h DSTCR DstMoRv
DstHrFd21 DstHrFd20 DstHrFd13 DstHrFd12 DstHrFd11 DstHrFd10 0 to 23
XDstMoRv2 DstMoRv13 DstMoR12v DstMoRv11 DstMoRv10 01 to 12
DstDwRvE DstWkrv12 DstWkRv11 DstWkRv10 DstDwRv12 DstDwRv11 DstDwRv10 0 to 6
DstDtRv21 DstDtRv20 DstDtRv13 DstDtRv12 DstDtRv11 DstDtRv10 01 to 31
DstHrRv21 DstHrRv20 DstHrRv13 DstHrRv12 DstHrRv11 DstHrRv10 0 to 23
00 to FF
00 to 03
NPPML NPPM7 NPPM6 NPPM5 NPPM4 NPPM3 NPPM2 NPPM1 NPPM0 00 to FF
NPPM10 NPPM9 NPPM8 00 to 07
00 to FF
2Dh ALPHAH ALPHAH
ALP_H6 ALP_H5 ALP_H4 ALP_H3 ALP_H2 ALP_H1 ALP_H0 00 to 7F
GPM1 GPM17 GPM16 GPM15 GPM14 GPM13 GPM12 GPM11 GPM10 00 to FF
GPM2 GPM27 GPM26 GPM25 GPM24 GPM23 GPM22 GPM21 GPM20 00 to FF
Real Time Clock Registers
Addresses [00h to 06h]
RTC REGISTERS (SC, MN, HR, DT, MO, YR, DW)
These registers depict BCD representations of the time.
As such, SC (Seconds) and MN (Minutes) range from 0 to
59, HR (Hour) can either be a 12-hour or 24-hour mode,
DT (Date) is 1 to 31, MO (Month) is 1 to 12, YR (Year) is
0 to 99, and DW (Day of the Week) is 0 to 6.
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 0-1-2-3-
4-5-6-0-1-2-… The assignment of a numerical value to a
specific day of the week is arbitrary and may be decided
by the system software designer. The default value is
defined as “0”.
If the MIL bit of the HR register is “1”, the RTC uses a
24-hour format. If the MIL bit is “0”, the RTC uses a
12-hour format and HR21 bit functions as an AM/PM
indicator with a “1” representing PM. The clock defaults
to 12-hour format time with HR21 = “0”.
Leap years add the day February 29 and are defined as
those years that are divisible by 4. Years divisible by 100
are not leap years, unless they are also divisible by 400.
This means that the year 2000 is a leap year and the
year 2100 is not. The ISL12020M does not correct for the
leap year in the year 2100.
Control and Status Registers
Addresses [07h to 0Fh]
The Control and Status Registers consist of the Status
Register, Interrupt and Alarm Register, Analog Trimming
and Digital Trimming Registers.
Status Register (SR)
The Status Register is located in the memory map at
address 07h. This is a volatile register that provides
either control or status of RTC failure (RTCF), Battery
Level Monitor (LBAT85, LBAT75), alarm trigger, Daylight
Saving Time, crystal oscillator enable and temperature
conversion in progress bit.
TABLE 2. STATUS REGISTER (SR)
ADDR 7 6
07h BUSY OSCF DSTDJ ALM LVDD LBAT85 LBAT75 RTCF
BUSY BIT (BUSY)
Busy Bit indicates temperature sensing is in progress. In
this mode, Alpha, Beta and ITRO registers are disabled
and cannot be accessed.
February 11, 2010
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