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參數(shù)資料
| 型號： | M48T212V-85MH1E |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復及定時提取 |
| 英文描述： | REAL TIME CLOCK, PDSO44 |
| 封裝： | 0.330 INCH, ROHS COMPLIANT, PLASTIC, SOH-44 |
| 文件頁數(shù)： | 11/35頁 |
| 文件大?。?/td> | 348K |
| 代理商： | M48T212V-85MH1E |
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Obsolete
Product(s)
- Obsolete
Product(s)
M48T212V
Clock operation
3.5
Setting the alarm clock
Address locations 6h-2h contain the alarm settings. The alarm can be configured to go off at
a prescribed time on a specific month, date, hour, minute, or second or repeat every year,
month, day, hour, minute, or second. It can also be programmed to go off while the
M48T212V is in the battery back-up to serve as a system wake-up call.
Bits RPT5-RPT1 put the alarm in the repeat mode of operation. Table 8 shows the possible
configurations. Codes not listed in the table default to the once per second mode to quickly
alert the user of an incorrect alarm setting.
Note:
User must transition address (or toggle chip enable) to see Flag Bit change.
When the clock information matches the alarm clock settings based on the match criteria
defined by RPT5-RPT1, the AF (Alarm Flag) is set.
If AFE (Alarm Flag Enable) is also set, the alarm condition activates the IRQ/FT pin. To
disable alarm, write '0' to the Alarm Date registers and RPT1-5. The IRQ/FT output is
cleared by a READ to the Flags Register as shown in Figure 7. A subsequent READ of the
Flags Register is necessary to see that the value of the Alarm Flag has been reset to '0.'
The IRQ/FT pin can also be activated in the battery back-up mode. The IRQ/FT will go low if
an alarm occurs and both ABE (Alarm in Battery Back-up Mode Enable) and AFE are set.
The ABE and AFE Bits are reset during power-up, therefore an alarm generated during
power-up will only set AF. The user can read the Flag Register at system boot-up to
determine if an alarm was generated while the M48T212V was in the deselect mode during
power-up. Figure 8 on page 20 illustrates the back-up mode alarm timing.
Figure 7.
Alarm interrupt reset waveforms
Table 8.
Alarm repeat modes
RPT5
RPT4
RPT3
RPT2
RPT1
Alarm setting
1
1111
Once per second
1
1110
Once per minute
1
1100
Once per hour
1
1000
Once per day
1
0000
Once per month
0
0000
Once per year
AI03021
A0-A3
ACTIVE FLAG BIT
ADDRESS 0h
IRQ/FT
HIGH-Z
1h
Fh
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| M48T35V-10MH1 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M48T212V-85MH1F | 功能描述:監(jiān)控電路 SRAM TK 16X8 85ns RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| M48T212V-85MH1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212V-85MH6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212V-85MH6E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212V-85MH6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
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