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| 型號(hào)： | M48T513V-85PL1 |
| 廠商： | STMICROELECTRONICS |
| 元件分類(lèi)： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, DMA36 |
| 封裝： | PLASTIC, MODULE, DIP-36 |
| 文件頁(yè)數(shù)： | 8/31頁(yè) |
| 文件大?。?/td> | 169K |
| 代理商： | M48T513V-85PL1 |
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M48T513Y, M48T513V
16/31
Table 10. Power Down/Up Trip Points DC Characteristics
Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70
°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
2. All voltages referenced to VSS.
3. At 25
°C.
CLOCK OPERATIONS
TIMEKEEPER Registers
The M48T513Y/V offers 16 internal registers
which contain TIMEKEEPER, Alarm, Watchdog,
Interrupt, Flag, and Control data (see Table 11,
page 17). These registers are memory locations
which contain external (user accessible) and inter-
nal copies of the data (usually referred to as Bi-
PORT
TIMEKEEPER cells). The external
copies are independent of internal functions ex-
cept that they are updated periodically by the si-
multaneous transfer of the incremented internal
copy. TIMEKEEPER and Alarm Registers store
data in BCD.
Reading the Clock
Updates to the TIMEKEEPER registers should
be halted before clock data is read to prevent
reading data in transition. The BiPORT
TIME-
KEEPER cells in the RAM array are only data reg-
isters and not the actual clock counters, so
updating the registers can be halted without dis-
turbing the clock itself.
Updating is halted when a ’1’ is written to the
READ Bit, D6 in the Control Register (7FFF8h). 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 time that were
current at the moment the halt command was is-
sued. All of the TIMEKEEPER registers are updat-
ed simultaneously. A halt will not interrupt an
update in progress. Updating occurs 1 second af-
ter the READ Bit is reset to a ’0.’
Setting the Clock
Bit D7 of the Control Register (7FFF8h) is the
WRITE Bit. Setting the WRITE Bit to a ’1’, like the
READ Bit, halts updates to the TIMEKEEPER reg-
isters. The user can then load them with the cor-
rect day, date, and time data in 24 hour BCD
format (see Table Figure 11, page 17).
Resetting the WRITE Bit to a ’0’ then transfers the
values of all time registers (7FFFFh-7FFF9h,
7FFF1h) to the actual TIMEKEEPER counters and
allows normal operation to resume. After the
WRITE Bit is reset, the next clock update will occur
approximately one second later.
Note: Upon power-up following a power failure,
both the WRITE Bit and the READ Bit will be reset
to ’0.’
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 located at Bit D7 within 7FFF9h. Setting it to
a ’1’ stops the oscillator. When reset to a ’0,’ the
M48T513Y/V oscillator starts within one second.
Note: It is not necessary to set the WRITE Bit
when setting or resetting the FREQUENCY TEST
Bit (FT) or the STOP Bit (ST).
Symbol
Parameter(1,2)
Min
Typ
Max
Unit
VPFD
Power-fail Deselect Voltage
M48T513Y
4.2
4.35
4.5
V
M48T513V
2.7
2.9
3.0
V
VSO
Battery Back-up Switchover Voltage
M48T513Y
3.0
V
M48T513V
VPFD –100mV
tDR
(3)
Expected Data Retention Time
10
YEARS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M48T513Y-70PM1 | 0 TIMER(S), REAL TIME CLOCK, PDIP36 |
| M48T513V-85PM1 | 0 TIMER(S), REAL TIME CLOCK, PDIP36 |
| M62320GP | 8 I/O, PIA-GENERAL PURPOSE, PDSO16 |
| M62320P | 8 I/O, PIA-GENERAL PURPOSE, PDIP16 |
| M62320FP | 8 I/O, PIA-GENERAL PURPOSE, PDSO16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M48T513V-85PM1 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513VPM | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513VSH | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513Y | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
| M48T513Y-70CS1 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:3.3V-5V 4 Mbit 512Kb x8 TIMEKEEPER SRAM |
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