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參數資料
| 型號： | M48T08-150PC1 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數據恢復及定時提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| 封裝： | 0.600 INCH, ROHS COMPLIANT, PLASTIC, PCDIP-28 |
| 文件頁數： | 6/31頁 |
| 文件大?。?/td> | 256K |
| 代理商： | M48T08-150PC1 |
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Clock operations
M48T08, M48T08Y, M48T18
3
Clock operations
3.1
Reading the clock
Updates to the TIMEKEEPER registers should be halted before clock data is read to
prevent reading data in transition. The BiPORT 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, the seventh bit in the control
register. 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 issued.
All of the TIMEKEEPER registers are updated simultaneously. A halt will not interrupt an
update in progress. Updating is within a second after the bit is reset to a '0.'
3.2
Setting the clock
The eighth bit of the control register 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 (on Table 5). Resetting the
WRITE bit to a '0' then transfers the values of all time registers (1FF9h-1FFFh) to the actual
TIMEKEEPER counters and allows normal operation to resume. The FT bit and the bits
marked as '0' in Table 5 must be written to '0' to allow for normal TIMEKEEPER and RAM
operation.
See the application note AN923, “TIMEKEEPER rolling Into the 21st century” for
information on century rollover.
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| M48T18-100PC1 | 0 TIMER(S), REAL TIME CLOCK, PDIP28 |
| M48T201V-85MH1TR | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201Y-70MH1F | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| M48T08-150PC1 | 制造商:STMicroelectronics 功能描述:NVRAM Memory IC |
| M48T08-150PC1E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM |
| M48T08-150PC1F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM |
| M48T08-150PC1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM |
| M48T08MH | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM |
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