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X1205V8Z View Datasheet(PDF) - Intersil

Part NameDescriptionManufacturer
X1205V8Z 2-Wire™ RTC Real Time Clock/Calendar Intersil
Intersil Intersil
X1205V8Z Datasheet PDF : 22 Pages
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X1205
RTCF: Real Time Clock Fail Bit-Volatile
This bit is set to a ‘1’ after a total power failure. This is
a read only bit that is set by hardware (X1205 inter-
nally) when the device powers up after having lost all
power to the device. The bit is set regardless of
whether VCC or VBACK is applied first. The loss of only
one of the supplies does not result in setting the RTCF
bit. The first valid write to the RTC after a complete
power failure (writing one byte is sufficient) resets the
RTCF bit to ‘0’.
Table 2. Clock/Control Memory Map
Addr.
Type
Reg
Name
7
6
5
Bit
4
3
2
1
Range
0
003F
Status
SR
BAT
AL1
AL0
0
0
RWEL
WEL
RTCF
01h
0037 RTC (SRAM) Y2K
0
0
Y2K21 Y2K20 Y2K13
0
0
Y2K10
20h
0036
DW
0
0
0
0
0
DY2
DY1
DY0
0-6 00h
0035
YR
Y23
Y22
Y21
Y20
Y13
Y12
Y11
Y10 0-99 00h
0034
MO
0
0
0
G20
G13
G12
G11
G10 1-12 00h
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
0
0
M22
S22
0
0
AL1E
0
D21
H21
M21
S21
0
ATR5
AL0E
0
D20
H20
M20
S20
0
ATR4
0
0
D13
H13
M13
S13
0
ATR3
0
0
D12
H12
M12
S12
DTR2
ATR2
X
0
D11
H11
M11
S11
DTR1
ATR1
X
0
D10
H10
M10
S10
DTR0
ATR0
X
0
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
10
FN8097.2
September 23, 2005
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