X1202
Table 1. Clock/Control Memory Map
Bit
Reg
Name
Addr.
Type
Range
7
6
5
4
3
2
1
0 (optional)
003F
0037
0036
0035
0034
0033
0032
0031
0030
0010
Status
SR
Y2K
DW
YR
MO
DT
BAT
0
AL1
0
AL0
Y2K21
0
0
Y2K20
0
0
Y2K13
0
RWEL
0
WEL
0
RTCF
Y2K10
DY0
Y10
G10
D10
H10
M10
S10
0
01h
20h
00h
00h
00h
00h
00h
00h
00h
00h
RTC
(SRAM)
19/20
0-6
0
0
DY2
Y12
G12
D12
H12
M12
S12
0
DY1
Y11
G11
D11
H11
M11
S11
0
Y23
0
Y22
0
Y21
0
Y20
G20
D20
H20
M20
S20
WD1
Y13
G13
D13
H13
M13
S13
WD0
0-99
1-12
1-31
0-23
0-59
0-59
0
0
D21
H21
M21
S21
0
HR
MN
SC
BL
MIL
0
0
M22
S22
0
0
Control
(EEPROM)
0
000F
000E
000D
000C
000B
000A
0009
0008
0007
0006
0005
0004
0003
0002
0001
0000
Alarm1
(EEPROM)
Y2K0
0
0
0
A1Y2K21 A1Y2K20 A1Y2K13
0
0
A1Y2K10 19/20
20h
00h
DWA0 EDW1
YRA0
0
0
0
DY2
DY1
DY0
0-6
Unused - Default = RTC Year value
MOA0 EMO1
0
0
A1G20
A1D20
A1H20
A1M20
A1S20
A1G13
A1D13
A1H13
A1M13
A1S13
A1G12
A1D12
A1H12
A1M12
A1S12
0
A1G11
A1D11
A1H11
A1M11
A1S11
0
A1G10
A1D10
A1H10
A1M10
A1S10
1-12
1-31
0-23
0-59
0-59
00h
00h
00h
00h
00h
20h
00h
DTA0
HRA0
EDT1
EHR1
0
A1D21
A1H21
A1M21
A1S21
0
A1M22
A1S22
0
MNA0 EMN1
SCA0
Y2K1
ESC1
0
Alarm0
(EEPROM)
A0Y2K21 A0Y2K20 A0Y2K13
A0Y2K10 19/20
DWA1 EDW0
YRA1
0
0
0
0
DY2
DY1
DY0
0-6
Unused - Default = RTC Year value
MOA1 EMO0
0
0
0
A0G20
A0D20
A0H20
A0M20
A0S20
A0G13
A0D13
A0H13
A0M13
A0S13
A0G12
A0D12
A0H12
A0M12
A0S12
A0G11
A0D11
A0H11
A0M11
A0S11
A0G10
A0D10
A0H10
A0M10
A0S10
1-12
1-31
0-23
0-59
0-59
00h
00h
00h
00h
00h
DTA1
HRA1
EDT0
EHR0
A0D21
A0H21
A0M21
A0S21
0
MNA1 EMN0
SCA1 ESC0
A0M22
A0S22
REAL TIME CLOCK REGISTERS
Year 2000 (Y2K)
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 specific day of the week is arbitrary and may be
decided by the system software designer. The Clock
Default values define 0 = Sunday.
The X1202 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.
Characteristics subject to change without notice. 4 of 23
REV 1.1.8 5/17/01
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