參數(shù)資料
型號(hào)： M41T56MH6F
廠商： STMICROELECTRONICS
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： REAL TIME CLOCK, PDSO28
封裝： 0.330 INCH, SNAPHAT, LEAD FREE, PLASTIC, SOH-28
文件頁(yè)數(shù)： 6/28頁(yè)
文件大?。?/td> 244K
代理商： M41T56MH6F
Clock operation
M41T56
3
Clock operation
The eight byte clock register (see Table 3) is used to both set the clock and to read the date
and time from the clock, in a binary coded decimal format. Seconds, Minutes, and Hours are
contained within the first three registers. Bits D6 and D7 of Clock Register 2 (Hours
Register) contain the CENTURY ENABLE Bit (CEB) and the CENTURY Bit (CB). Setting
CEB to a '1' will cause CB to toggle, either from '0' to '1' or from '1' to '0' at the turn of the
century (depending upon its initial state). If CEB is set to a '0,' CB will not toggle. Bits D0
through D2 of Register 3 contain the Day (day of week). Registers 4, 5, and 6 contain the
Date (day of month), Month, and Years. The final register is the Control Register (this is
described in the Clock Calibration section). Bit D7 of Register 0 contains the STOP Bit (ST).
Setting this bit to a '1' will cause the oscillator to stop.
If the device is expected to spend a significant amount of time on the shelf, the oscillator
may be stopped to reduce current drain. When reset to a '0' the oscillator restarts within one
second.
The seven Clock Registers may be read one byte at a time, or in a sequential block. The
Control Register (Address location 7) may be accessed independently. Provision has been
made to assure that a clock update does not occur while any of the seven clock addresses
are being read. If a clock address is being read, an update of the clock registers will be
delayed by 250ms to allow the READ to be completed before the update occurs. This will
prevent a transition of data during the READ.
Note:
This 250ms delay affects only the clock register update and does not alter the actual clock
time.
Table 3.
Register map(1)
1.
Keys:
S = SIGN Bit
FT = FREQUENCY TEST Bit
ST = STOP Bit
OUT = Output level
X = Don't care
CEB = Century Enable Bit
CB = Century Bit
Address
Data
Function/range
BCD format
D7
D6
D5
D4
D3
D2
D1
D0
0
ST
10 Seconds
Seconds
00-59
1
X
10 Minutes
Minutes
00-59
2CEB(2)
2.
When CEB is set to '1,' CB toggles from '0' to '1' or from '1' to '0' every 100 years (dependent upon the
initial value set). When CEB is set to '0,' CB does not toggle.
CB
10 hours
Hours
Century/hours
0-1/00-23
3X
X
Day
01-07
4
X
10 date
Date
01-31
5
X
10 M.
Month
01-12
6
10 years
Years
Year
00-99
7
OUT
FT
S
Calibration
Control
相關(guān)PDF資料
PDF描述
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