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參數(shù)資料
| 型號： | M41T56BN6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大小： | 163K |
| 代理商： | M41T56BN6 |
M41T56
14/24
CLOCK OPERATION
The eight byte clock register (see Table 10) is
used to both set the clock and to read the date and
time from the clock, in a binary coded decimal for-
mat. 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 tog-
gle, 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 in-
dependently. 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 reg-
isters 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 reg-
ister update and does not alter the actual clock
time.
Table 10. Register Map
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
Note: 1. When CEB is set to ’1,’ CB will toggle 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 will not toggle.
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
2
CEB (1)
CB
10 Hours
Hours
Century/Hours
0-1/00-23
3
XXXXX
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
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