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X1226S8I bảng dữ liệu(PDF) 4 Page - Xicor Inc.

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Giải thích chi tiết về linh kiện  Real Time Clock/Calendar with EEPROM
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nhà sản xuất  XICOR [Xicor Inc.]
Trang chủ  http://www.xicor.com
Logo XICOR - Xicor Inc.

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X1226
REV 1.1.24 1/13/03
Characteristics subject to change without notice.
4 of 24
www.xicor.com
Table 1. Clock/Control Memory Map
Addr.
Type
Reg
Name
Bit
Range
7
6
54321
0 (optional)
003F
Status
SR
BAT
AL1
AL0
0
0
RWEL
WEL
RTCF
01h
0037
RTC
(SRAM)
Y2K
0
0
Y2K21
Y2K20
Y2K13
0
0
Y2K10
19/20
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
0
D21
D20
D13
D12
D11
D10
1-31
00h
0032
HR
MIL
0
H21
H20
H13
H12
H11
H10
0-23
00h
0031
MN
0
M22
M21
M20
M13
M12
M11
M10
0-59
00h
0030
SC
0
S22
S21
S20
S13
S12
S11
S10
0-59
00h
0013
Control
(EEPROM)
DTR
0
0
0
0
0
DTR2
DTR1
DTR0
00h
0012
ATR
0
0
ATR5
ATR4
ATR3
ATR2
ATR1
ATR0
00h
0011
INT
IM
AL1E
AL0E
FO1
FO0
X
X
X
00h
0010
BL
BP2
BP1
BP0
00000
00h
000F
Alarm1
(EEPROM)
Y2K1
0
0
A1Y2K21
A1Y2K20
A1Y2K13
0
0
A1Y2K10
19/20
20h
000E
DWA1
EDW1
0
0
0
0
DY2
DY1
DY0
0-6
00h
000D
YRA1
Unused - Default = RTC Year value (No EEPROM) - 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
(EEPROM)
Y2K0
0
0
A0Y2K21
A0Y2K20
A0Y2K13
0
0
A0Y2K10
19/20
20h
0006
DWA0
EDW0
0
0
0
0
DY2
DY1
DY0
0-6
00h
0005
YRA0
Unused - Default = RTC Year value (No EEPROM) - 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
Each register is read and written through buffers. The
non-volatile portion (or the counter portion of the RTC) is
updated only if RWEL is set and only after a valid write
operation and stop bit. A sequential read or page write
operation provides access to the contents of only one
section of the CCR per operation. Access to another sec-
tion requires a new operation. Continued reads or writes,
once reaching the end of a section, will wrap around to
the start of the section. A read or write can begin at any
address in the CCR.
It is not necessary to set the RWEL bit prior to writing
the status register. Section 5 (status register) supports
a single byte read or write only. Continued reads or
writes from this section terminates the operation.
The state of the CCR can be read by performing a ran-
dom read at any address in the CCR at any time. This
returns the contents of that register location. Addi-
tional registers are read by performing a sequential
read. The read instruction latches all Clock registers
into a buffer, so an update of the clock does not
change the time being read. A sequential read of the
CCR will not result in the output of data from the mem-
ory array. At the end of a read, the master supplies a
stop condition to end the operation and free the bus.
After a read of the CCR, the address remains at the
previous address +1 so the user can execute a current
address read of the CCR and continue reading the
next Register.


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