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參數(shù)資料
| 型號： | M48T35Y-70PC6 |
| 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, PDIP28 |
| 封裝： | 0.600 INCH, CAPHAT, PLASTIC, DIP-28 |
| 文件頁數(shù)： | 7/26頁 |
| 文件大小： | 349K |
| 代理商： | M48T35Y-70PC6 |
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M48T35, M48T35Y
CLOCK OPERATIONS
Reading the Clock
ble 11) should be halted before clock data is read
to prevent reading data in transition. The Bi-
PORT TIMEKEEPER cells in the RAM array are
only data registers and not the actual clock
counters, so updating the registers can be halted
without disturbing the clock itself.
Updating is halted when a '1' is written to the
READ Bit, D6 in the Control Register 7FF8h. As
long as a '1' remains in that position, updating is
halted.
After a halt is issued, the registers reflect the
count; that is, the day, date, and the time that were
current at the moment the halt command was is-
sued.
All of the TIMEKEEPER registers are updated si-
multaneously. A halt will not interrupt an update in
progress. Updating is within a second after the bit
is reset to a '0.'
Setting the Clock
Bit D7 of the Control Register 7FF8h is the WRITE
Bit. Setting the WRITE Bit to a '1,' like the READ
Bit, halts updates to the TIMEKEEPER registers.
The user can then load them with the correct day,
date, and time data in 24 hour BCD format (see
Table 11, page 15). Resetting the WRITE Bit to a
'0' then transfers the values of all time registers
7FF9h-7FFFh
to
the
actual
TIMEKEEPER
counters and allows normal operation to resume.
The FT Bit and the bits marked as '0' in Table 11
must be written to '0' to allow for normal TIME-
KEEPER and RAM operation. After the WRITE Bit
is reset, the next clock update will occur within one
second.
See the Application Note AN923, “TIMEKEEPER
Rolling Into the 21st Century” for information on
Century Rollover.
Stopping and Starting the Oscillator
The oscillator may be stopped at any time. If the
device is going to spend a significant amount of
time on the shelf, the oscillator can be turned off to
minimize current drain on the battery. The STOP
Bit is the MSB of the seconds register. Setting it to
a '1' stops the oscillator. The M48T35/Y is shipped
from STMicroelectronics with the STOP Bit set to
a '1.' When reset to a '0,' the M48T35/Y oscillator
starts within 1 second.
Table 11. Register Map
Keys: S = SIGN Bit
FT = FREQUENCY TEST Bit (Must be set to '0' upon power
for normal operation)
R = READ Bit
W = WRITE Bit
ST = STOP Bit
0 = Must be set to '0'
CEB = Century Enable Bit
CB = Century Bit
Note: When CEB is set to '1,' CB will toggle from '0' to '1' or from '1' to '0' at the turn of the century (dependent upon the initial value set).
When CEB is set to '0,' CB will not toggle. The WRITE Bit does not need to be set to write to CEB.
Address
Data
Function/Range
BCD Format
D7
D6
D5
D4
D3
D2
D1
D0
7FFFh
10 Years
Year
00-99
7FFEh
0
10 M.
Month
01-12
7FFDh
0
10 Date
Date
01-31
7FFCh
0
FT
CEB
CB
0
Day
Century/Day
00-01/01-07
7FFBh
0
10 Hours
Hours
00-23
7FFAh
0
10 Minutes
Minutes
00-59
7FF9h
ST
10 Seconds
Seconds
00-59
7FF8h
W
R
S
Calibration
Control
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48T35Y-70PC6E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V, 256 Kbit (32 Kb x 8) TIMEKEEPER SRAM |
| M48T35Y-70PC6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V, 256 Kbit (32 Kb x 8) TIMEKEEPER SRAM |
| M48T35Y-70PC6TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:256 Kbit 32Kb x8 TIMEKEEPER SRAM |
| M48T35Y-70PM1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V, 256 Kbit (32 Kb x 8) TIMEKEEPER SRAM |
| M48T35Y-70PM1E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V, 256 Kbit (32 Kb x 8) TIMEKEEPER SRAM |
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