ISL1218 Intersil Corporation, ISL1218 Datasheet - Page 10

• Manufacturer Part Number: ISL1218
• Description: I2C Real Time Clock/Calendar
• Manufacturer: Intersil Corporation

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Write capability is allowable into the RTC registers (00h to
06h) only when the WRTC bit (bit 4 of address 07h) is set to
“1”. A multi-byte read or write operation is limited to one
section per operation. Access to another section requires a
new operation. A read or write can begin at any address
within the section.
A register can be read by performing a random read at any
address at any time. This returns the contents of that register
location. Additional registers are read by performing a
sequential read. For the RTC and Alarm registers, the read
ADDR. SECTION
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
Control
Status
Alarm
RTC
User
and
NAME
USR1
USR2
USR3
USR4
USR5
USR6
USR7
USR8
DWA
REG
MNA
MOA
DTR
SCA
HRA
ATR
DTA
DW
MN
MO
INT
SC
HR
YR
SR
DT
Reserved
BMATR1
USR17
USR27
USR37
USR47
USR57
USR67
USR77
USR87
EMNA
EMOA
EDWA
10
ESCA
EHRA
ARST
EDTA
YR23
MIL
IM
0
0
0
0
0
7
XTOSCB Reserved
BMATR0
AMN22
ASC22
USR16
USR26
USR36
USR46
USR56
USR66
USR76
USR86
MN22
ALME
SC22
YR22
6
0
0
0
0
0
0
0
0
TABLE 1. REGISTER MEMORY MAP
LPMODE FOBATB
AMN21
USR15
ASC21
AHR21
ADT21
USR25
USR35
USR45
USR55
USR65
USR75
USR85
MN21
SC21
HR21
DT21
YR21
ATR5
5
0
0
0
0
AMN20
AMO20
ISL1218
AHR20
USR14
USR24
USR34
USR44
USR54
USR64
USR74
USR84
Reserved
ASC20
ADT20
WRTC
MO20
MN20
HR20
SC20
DT20
YR20
ATR4
4
0
0
BIT
Reserved
AMN13
AMO13
instruction latches all clock registers into a buffer, so an
update of the clock does not change the time being read. A
sequential read will not result in the output of data from the
memory array. At the end of a read, the master supplies a
stop condition to end the operation and free the bus. After a
read, the address remains at the previous address +1 so the
user can execute a current address read and continue
reading the next register.
It is not necessary to set the WRTC bit prior to writing into
the control and status, alarm, and user SRAM registers.
ASC13
AHR13
USR13
USR23
USR33
USR43
USR53
USR63
USR73
USR83
ADT13
MN13
MO13
SC13
HR13
YR13
DT13
ATR3
FO3
3
0
0
AMO12
ADW12
AMN12
AHR12
USR12
USR22
USR32
USR42
USR52
USR62
USR72
USR82
ASC12
ADT12
MN12
MO12
DTR2
SC12
HR12
DT12
YR12
ATR2
DW2
ALM
FO2
2
ADW11
AMN11
AMO11
USR21
USR31
USR41
USR51
USR61
USR71
USR81
ASC11
AHR11
ADT11
USR11
MN11
MO11
DTR1
SC11
HR11
DT11
YR11
ATR1
DW1
FO1
BAT
1
ADW10
AMN10
AMO10
ASC10
AHR10
ADT10
USR10
USR20
USR30
USR40
USR50
USR60
USR70
USR80
MN10
MO10
RTCF
SC10
HR10
YR10
ATR0
DTR0
DT10
DW0
FO0
0
RANGE
00-59
00-59
0-59
0-59
0-23
1-31
1-12
0-99
0-23
1-31
1-12
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0-6
0-6
DEFAULT
June 22, 2006
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
00h
01h
00h
00h
00h
00h
00h
00h
00h
FN6313.0