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參數(shù)資料
| 型號： | M41T81MQ6 |
| 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： | 1 TIMER(S), REAL TIME CLOCK, PDSO16 |
| 封裝： | PLASTIC, SOIC-16 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 179K |
| 代理商： | M41T81MQ6 |
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M41T81
CLOCK OPERATION
The twenty byte clock register (see Table 10, page
16) is used to both set the clock and to read the
date and time from the clock, in a binary coded
decimal format. Tenths/Hundredths of Seconds,
Seconds, Minutes, and Hours are contained within
the first four registers. Bits D6 and D7 of clock
register 3 (Century/Hours Register) contain the
CENTURY ENABLE Bit (CEB) and the CENTURY
Bit (CB). Setting CEB to a ‘1’ will cause CB to tog-
gle, either from ‘0’ to ‘1’ or from ‘1’ to ‘0’ at the turn
of the century (depending upon its initial state). If
CEB is set to a ‘0’, CB will not toggle. Bits D0
through D2 of register 4 contain the Day (day of
week). Registers 5, 6 and 7 contain the Date (day
of month), Month and Years. The ninth clock reg-
ister is the Control Register (this is described in the
Clock Calibration section).
Bit D7 of register 1
contains the STOP Bit (ST). Setting this bit to a ‘1’
will cause the oscillator to stop. If the device is ex-
pected to spend a significant amount of time on
the shelf, the oscillator may be stopped to reduce
current drain. When reset to a ‘0’ the oscillator re-
starts within one second.
The eight Clock Registers may be read one byte at
a time, or in a sequential block. The Control Reg-
ister (Address location 08h) may be accessed in-
dependently. Provision has been made to assure
that a clock update does not occur while any of the
seven clock addresses are being read. If a clock
address is being read, an update of the clock reg-
isters will be halted. This will prevent a transition
of data during the read.
Note: Upon power-up following a power failure,
the HT bit will automatically be set to a ‘1’. This will
prevent the clock from updating the TIMEKEEPER
registers, and will allow the user to read the exact
time of the power-down event. Resetting the HT
bit to a ‘0’ will allow the clock to update the TIME-
KEEPER registers with the current time.
TIMEKEEPER Registers
The M41T81 offers 20 internal registers which
contain Clock, Alarm, Watchdog, Flag, Square
Wave and Control data. These registers are mem-
ory locations which contain external (user accessi-
ble) and internal copies of the data (usually
referred to as BiPORTTM TIMEKEEPER cells).
The external copies are independent of internal
functions except that they are updated periodically
by the simultaneous transfer of the incremented
internal copy. TIMEKEEPER and Alarm Registers
store data in BCD. Control, Watchdog and Square
Wave Registers store data in Binary Format.
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| M41T81MY6E | 1 TIMER(S), REAL TIME CLOCK, PDSO18 |
| M41T94MQ6TR | 1 TIMER(S), REAL TIME CLOCK, PDSO16 |
| M44C092-H | 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41T81MX | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SERIAL ACCESS RTC WITH ALARMS |
| M41T81MX6 | 功能描述:實時時鐘 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41T81MX6TR | 功能描述:實時時鐘 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41T81MY | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SERIAL ACCESS RTC WITH ALARMS |
| M41T81MY6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Real-Time Clock with Alarms |
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