isl12032 Intersil Corporation, isl12032 Datasheet - Page 13

• Manufacturer Part Number: isl12032
• Description: Low Power Rtc With Battery Backed Sram And 50/60 Cycle Ac Input And Xtal Back-up
• Manufacturer: Intersil Corporation

Real Time Clock Registers
Addresses [00h to 07h]
RTC REGISTERS (SC, MN, HR, DT, MO, YR, DW, SS)
These registers depict BCD representations of the time. As
such, SC (Seconds) and MN (Minutes) range from 0 to 59, HR
(Hour) can be either 12-hour or 24-hour mode, DT (Date) is 1
to 31, MO (Month) is 1 to 12, YR (Year) is 0 to 99, DW (Day of
the Week) is 0 to 6, and SS (Sub-Second) is 0 to 9. The Sub-
Second register is read-only and will clear to “0” count each
time there is a write to a register in the RTC section.
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”.
24 HOUR TIME
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
ADDR SECTION
2Ah
2Bh
2Ch
2Dh
2Eh
23h
24h
25h
26h
27h
28h
29h
2Fh
30h
31h
32h
33h
34h
35h
36h
37h
Alarm1
TSV2B
TSB2V
TSEVT
TABLE 1. REGISTER MEMORY MAP (X indicates writes to these bits have no effect on the device)
NAME
MOA1
DWA1
MNVB
MOVB
MNBV
MOBV
REG
MNA1
HRA1
SCVB
HRVB
DTVB
SCBV
HRBV
DTBV
SCA1
DTA1
MNT
MOT
SCT
HRT
DTT
13
EMOA1
EDWA1
ESCA1
EMNA1
EHRA1
EDTA1
MILVB
MILBV
MILT
X
X
X
X
X
X
X
X
X
X
X
X
7
MNVB22
MNBV22
MNA122
SCBV22
SCBV22
SCA122
MNT22
SCT22
6
0
0
0
0
X
X
X
X
X
X
X
X
X
MNVB21
MNBV21
MNA121
HRA121
SCBV21
HRVB21
DTVB21
SCBV21
HRBV21
DTBV21
SCA121
DTA121
MNT21
SCT21
HRT21
DTT21
5
0
0
X
X
X
ISL12032
MOA120
MNVB20
MOVB20
MNBV20
MOBV20
MNA120
HRA120
SCBV20
HRVB20
DTVB20
SCBV20
HRBV20
DTBV20
SCA120
DTA120
MNT20
MOT20
SCT20
HRT20
DTT20
4
0
BIT
“1” representing PM. The clock defaults to 12-hour format
time with HR21 = “0”.
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 and the year 2100 is not. The
ISL12032 does not correct for the leap year in the year 2100.
Status Registers (SR)
Addresses [08h to 09h]
The Status Registers consist of the DC and AC status
registers (see Tables 2 and 3).
Status Register (SRDC)
The Status Register DC is located in the memory map at
address 08h. This is a volatile register that provides status of
RTC failure (RTCF), Battery Level Monitor (LBAT85,
LBAT75), V
trigger, Daylight Saving Time adjustment, and Battery active
mode.
MNVB13
MOVB13
MNBV13
HRBV13
MOBV13
MNA113
HRA113
MOA113
SCVB13
HRVB13
DTVB13
SCBV13
DTBV13
SCA113
DTA113
MNT13
MOT13
SCT13
HRT13
DTT13
3
0
MOVB12
MOBV12
MOA112
MNVB12
HRVB12
MNBV12
HRBV12
MNA112
HRA112
SCVB12
DTVB12
SCBV12
DTBV12
SCA112
DTA112
DD
DWA12
MOT12
MNT12
HRT12
SCT12
DTT12
2
level monitor (LVDD), Alarm0 or Alarm1
MNVB11
MOVB11
MNBV11
MOBV11
MNA111
MOA111
SCVB11
HRVB11
DTVB11
SCBV11
HRBV11
DTBV11
SCA111
HRA111
SCT111
DTA111
DWA11
MNT11
MOT11
HRT11
DTT11
1
MNVB10
MOVB10
MNBV10
MOBV10
MOA110
SCVB10
HRVB10
SCBV10
HRBV10
SCA110
MNA110
HRA110
DTVB10
DTBV10
DTA110
DWA10
MNT10
MOT10
SCT10
HRT10
DTT10
0
RANGE
0 to 23
0 to 59
0 to 59
0 to 23
1 to 31
1 to 12
0 to 59
0 to 59
0 to 23
1 to 31
1 to 12
0 to 59
0 to 59
0 to 23
1 to 12
0 to 59
0 to 59
1 to 31
1 to 31
1 to12
0 to 6
December 14, 2007
DEFAULT
FN6618.0
00h
00h
00h
01h
01h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h