ISL12057 Ver la hoja de datos (PDF) - Intersil
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ISL12057 Datasheet PDF : 17 Pages
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ISL12057
TABLE 1. REGISTER MEMORY MAP
REG
BIT
REG
ADDR SECTION NAME
7
6
5
4
3
2
1
0
RANGE DEFAULT
00H
RTC
SC
0
SC22
SC21
SC20
SC13
SC12
SC11
SC10
0-59
00h
01H
MN
0
MN22
MN21
MN20 MN13
MN12
MN11
MN10
0-59
00h
02H
HR
0
MIL
AM/PM HR20
HR13
HR12
HR11
HR10
1-12
00h
+AM/PM
HR21
0-23
03H
DW
0
0
0
0
0
DW12 DW11 DW10
1-7
01h
04H
DT
0
0
DT21
DT20
DT13
DT12
DT11
DT10
1-31
01h
05H
MO CENTUR
0
0
MO20 MO13 MO12 MO11 MO10
0-12
01h
Y
+Century
06h
YR
YR23
YR22
YR21
YR20
YR13
YR12
YR11
YR10
0-99
00h
07h Alarm1 A1SC A1M1 A1SC22 A1SC21 A1SC20 A1SC13 A1SC12 A1SC11 A1SC10 0-59
00h
08h
A1MN A1M2 A1MN22 A1MN21 A1MN20 A1MN13 A1MN12 A1MN11 A1MN10 0-59
00h
09h
A1HR A1M3 A1MIL A1AM/PM A1HR20 A1HR13 A1HR12 A1HR11 A1HR10 1-12
00h
+AM/PM
A1HR21
0-23
0Ah
A1DW/ A1M4 A1DW/DT
0
0
0
A1DW12 A1DW11 A1DW10 1-7
00h
DT
A1DT21 A1DT20 A1DT13 A1DT12 A1DT11 A1DT10 1-31
00h
0Bh Alarm2 A2MN A2M2 A2MN22 A2MN21 A2MN20 A2MN13 A2MN12 A2MN11 A2MN10 0-59
00h
0Ch
A2HR A2M3 A2MIL A2AM/PM A2HR20 A2HR13 A2HR12 A2HR11 A2HR10 1-12
00h
+AM/PM
A2HR21
0-23
0Dh
A2DW/ A2M4 A2DW/DT
0
0
0
A2DW12 A2DW11 A2DW10 1-7
00h
DT
A2DT21 A2DT20 A2DT13 A2DT12 A2DT11 A2DT10 1-31
00h
0Eh Control INT EOSC
0
0
RS2
RS1
INTCN
A2IE
A1IE
N/A
18h
0Fh Status
SR
OSF
0
0
0
0
0
A2F
A1F
N/A
80h
Real Time Clock Registers
Addresses [00h to 06h]
RTC REGISTERS (SC, MN, HR, DW, DT, MO, YR)
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)
can either be a 12-hour or 24-hour mode, 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, and YR (Year,
address 06h) is 0 to 99.
The DW register provides a Day of the Week status and uses
3 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.
24-HOUR TIME
If the MIL bit of the HR register is “0”, the RTC uses a
24-hour format and bit 5 of the HR register is the second
10-hour bit (20–23 hours). If the MIL bit is “1”, the RTC uses
a 12-hour format and bit 5 of the HR register is the AM/PM
bit with logic high being PM. The clock defaults to 24-hour
format time.
CENTURY INDICATOR
The century bit (bit 7 of the MO register) is toggled when the
years register overflows from 99 to 00 to indicator the
change of century.
LEAP YEARS
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, the year 2100 is not. The
ISL12057 does not correct for the leap year in the year 2100.
Addresses [0Eh to 0Fh]
The Control and Status Registers consist of the Status
Register, Interrupt and Alarm Register.
9
FN6755.0
June 15, 2009
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