X1205 Datasheet, PDF (4/22 Pages) Xicor Inc. – Real Time Clock/Calendar

X1205 – Preliminary Information
– Setting the Enable Month Bit (EMOn*) bit in combi-
nation with other enable bits and a specific alarm
time, the user can establish an alarm that triggers at
the same time once a year.
*n = 0 for Alarm 0: N = 1 for Alarm 1
When there is a match, an alarm flag is set. The occur-
rence of an alarm can be determined by polling the
AL0 and AL1 bits or by enabling the IRQ output, using
it as hardware flag.
The alarm enable bits are located in the MSB of the
particular register. When all enable bits are set to ‘0’,
there are no alarms.
– The user can set the X1205 to alarm every Wednes-
day at 8:00 AM by setting the EDWn*, the EHRn*
and EMNn* enable bits to ‘1’ and setting the DWAn*,
HRAn* and MNAn* Alarm registers to 8:00AM
Wednesday.
– A daily alarm for 9:30PM results when the EHRn*
and EMNn* enable bits are set to ‘1’ and the HRAn*
and MNAn* registers are set to 9:30PM.
*n = 0 for Alarm 0: N = 1 for Alarm 1
Table 1. Clock/Control Memory Map
Addr.
Type
Reg
Name
7
6
5
Bit
4
3
2
1
Range
0
003F
Status
SR BAT
0037 RTC (SRAM) Y2K
0
0036
DW
0
0035
YR Y23
0034
MO
0
0033
DT
0
0032
HR MIL
0031
MN
0
0030
SC
0
0013
Control
DTR
0
0012 ^{(NONVOLATILE)} ATR
0
0011
INT IM
0010
0
0
AL1
0
0
Y22
0
0
0
M22
S22
0
0
AL1E
0
AL0
Y2K21
0
Y21
0
D21
H21
M21
S21
0
ATR5
AL0E
0
0
Y2K20
0
Y20
G20
D20
H20
M20
S20
0
ATR4
0
0
0
Y2K13
0
Y13
G13
D13
H13
M13
S13
0
ATR3
0
0
RWEL
0
DY2
Y12
G12
D12
H12
M12
S12
DTR2
ATR2
X
0
WEL
0
DY1
Y11
G11
D11
H11
M11
S11
DTR1
ATR1
X
0
RTCF
Y2K10
DY0
Y10
G10
D10
H10
M10
S10
DTR0
ATR0
X
0
01h
20h
0-6 00h
0-99 00h
1-12 00h
1-31 00h
0-23 00h
0-59 00h
0-59 00h
00h
00h
00h
00h
000F Alarm1 Y2K1 0
000E ^{(NONVOLATILE)} DWA1 EDW1
0 A1Y2K21 A1Y2K20 A1Y2K13 0
0
0
0
0
DY2
0 A1Y2K10
20h
DY1
DY0
0-6 00h
000D
YRA1
Unused – Default = RTC Year value – Future expansion
000C
MOA1 EMO1
0
0
A1G20 A1G13 A1G12 A1G11 A1G10 1-12 00h
000B
DTA1 EDT1
0
A1D21 A1D20 A1D13 A1D12 A1D11 A1D10 1-31 00h
000A
HRA1 EHR1
0
A1H21 A1H20 A1H13 A1H12 A1H11 A1H10 0-23 00h
0009
MNA1 EMN1 A1M22 A1M21 A1M20 A1M13 A1M12 A1M11 A1M10 0-59 00h
0008
SCA1 ESC1 A1S22 A1S21 A1S20 A1S13 A1S12 A1S11 A1S10 0-59 00h
0007 Alarm0 Y2K0 0
0006 ^{(NONVOLATILE)} DWA0 EDW0
0 A0Y2K21 A0Y2K20 A0Y2K13 0
0
0
0
0
DY2
0 A0Y2K10 19/20 20h
DY1
DY0
0-6 00h
0005
YRA0
Unused – Default = RTC Year value – Future expansion
0004
MOA0 EMO0
0
0
A0G20 A0G13 A0G12 A0G11 A0G10 1-12 00h
0003
DTA0 EDT0
0
A0D21 A0D20 A0D13 A0D12 A0D11 A0D10 1-31 00h
0002
HRA0 EHR0
0
A0H21 A0H20 A0H13 A0H12 A0H11 A0H10 0-23 00h
0001
MNA0 EMN0 A0M22 A0M21 A0M20 A0M13 A0M12 A0M11 A0M10 0-59 00h
0000
SCA0 ESC0 A0S22 A0S21 A0S20 A0S13 A0S12 A0S11 A0S10 0-59 00h
REV 1.0.9 8/29/02
www.xicor.com
Characteristics subject to change without notice. 4 of 22