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參數(shù)資料
| 型號： | DS1644L-120 |
| 英文描述： | Nonvolatile Timekeeping RAM |
| 中文描述： | 非易失性內(nèi)存時鐘 |
| 文件頁數(shù)： | 2/11頁 |
| 文件大?。?/td> | 108K |
| 代理商： | DS1644L-120 |
DS1644LPM
041697 2/11
CLOCK OPERATIONS –
READING THE CLOCK
While the double buffered register structure reduces the
chance of reading incorrect data, internal updates to the
DS1644L clock registers should be halted before clock
data is read to prevent reading of data in transition.
However, halting the internal clock register updating
process does not affect clock accuracy. Updating is
halted when a one is written into the read bit, the seventh
most significant bit in the control register. As long as a
one remains in that position, updating is halted. After a
halt is issued, the registers reflect the count, that is day,
date, and time that was current at the moment the halt
command was issued. However, the internal clock reg-
isters of the double buffered system continue to update
so that the clock accuracy is not affected by the access
of data. All of the DS1644L registers are updated simul-
taneously after the clock status is reset. Updating is
within a second after the read bit is written to zero.
DS1644L BLOCK DIAGRAM
Figure 1
COSCICHAIN
POWER MONITOR,
SWITCHING, AND
WRITE PROTECTION
V
CC
POWER GOOD
CLOCK
REGISTERS
CE
WE
A0–A14
DQ0–DQ7
32.768 KHz
+
OE
32K X 8
PFO
V
BAT
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| DS1644L-150 | Nonvolatile Timekeeping RAM |
| DS1644LPM | Nonvolatile Timekeeping RAM |
| DS1644 | Nonvolatile Timekeeping RAM |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1644L-15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock |
| DS1644L-150 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
| DS1644LPM | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
| DS1644P | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Nonvolatile Timekeeping RAM |
| DS1644P+120 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Nonvolatile Timekeeping RAM |
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