X1243 Datasheet, PDF (4/17 Pages) Xicor Inc. – Real Time Clock/Calendar/Alarm with EEPROM

X1243
TABLE 1. CLOCK/CONTROL MEMORY MAP
BIT
ADDR. TYPE
REG
NAME
003F Status
SR
0037
Y2K
0036
DW
0035
YR
0034
RTC
MO
0033 ^(SRAM)
DT
0032
HR
0031
MN
0030
SC
0011 Control
INT
(EEPROM)
0010
BL
000F
000E
DWA1
000D
YRA1
000C _Alarm1 MOA1
000B ^(EEPROM) DTA1
000A
HRA1
0009
MNA1
0008
SCA1
0007
0006
DWA1
0005
YRA0
0004 _Alarm0 MOA0
0003 ^(EEPROM) DTA0
0002
HRA0
0001
MNA0
0000
SCA0
7
BAT
0
0
Y23
0
0
T24
0
0
IM
BP2
EDW1
EMO1
EDT1
EHR1
EMN1
ESC1
EDW0
EMO0
EDT0
EHR0
EMN0
ESC0
6
AL1
0
0
Y22
0
0
0
M22
S22
AL1E
BP1
0
0
0
0
A1M22
A1S22
0
0
0
0
A0M22
A0S22
5
4
3
2
AL0
0
0
RWEL
Y2K21 Y2K20 Y2K13
0
0
0
0
DY2
Y21
Y20
Y13
Y12
0
G20
G13
G12
D21
D20
D13
D12
H21
H20
H13
H12
M21
M20
M13
M12
S21
S20
S13
S12
AL0E
0
0
0
BP0
0
0
0
unused
0
0
0
DY2
Unused - Default = RTC Year value
0
A1G20 A1G13 A1G12
A1D21 A1D20 A1D13 A1D12
A1H21 A1H20 A1H13 A1H12
A1M21 A1M20 A1M13 A1M12
A1S21 A1S20 A1S13 A1S12
unused
0
0
0
DY2
Unused - Default = RTC Year value
0
A0G20 A0G13 A0G12
A0D21 A0D20 A0D13 A0D12
A0H21 A0H20 A0H13 A0H12
A0M21 A0M20 A0M13 A0M12
A0S21 A0S20 A0S13 A0S12
1
WEL
0
DY1
Y11
G11
D11
H11
M11
S11
0
0
0
FACTORY
OPTIONAL RANGE SETTINGS
RTCF
01h
Y2K10
19/20
20h
DY0
0-6
00h
Y10
0-99
00h
G10
1-12
00h
D10
1-31
00h
H10
0-23
00h
M10
0-59
00h
S10
0-59
00h
0
00h
0
00h
DY1
DY0
0-6
00h
A1G11 A1G10
1-12
00h
A1D11 A1D10
1-31
00h
A1H11 A1H10
0-23
00h
A1M11 A1M10
0-59
00h
A1S11 A1S10
0-59
00h
DY1
DY0
0-6
00h
A0G11 A0G10
1-12
00h
A0D11 A0D10
1-31
00h
A0H11 A0H10
0-23
00h
A0M11 A0M10
0-59
00h
A0S11 A0S10
0-59
00h
Real Time Clock Registers
Year 2000 (Y2K)
The X1243 has a century byte that “rolls over” from 19 to 20
when the years byte changes from 99 to 00. The Y2K byte
can contain only the values of 19 or 20.
Day of the Week Register (DW)
This register provides a Day of the Week status and uses
three bits DY2 to DY0 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 specic day of
the week is arbitrary and may be decided by the system
software designer. The Clock Default values dene 0 =
Sunday.
Clock/Calendar Registers (YR, MO, DT, HR, MN, SC)
These registers depict BCD representations of the time. As
such, SC (Seconds) and MN (Minutes) range from 00 to 59,
HR (Hour) is 1 to 12 with an AM or PM indicator (H21 bit) or
0 to 23 (with T24 = 1), DT (Date) is 1 to 31, MO (Month) is 1
to 12, YR (year) is 0 to 99.
4
FN8249.0
April 28, 2005