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参数资料
| 型号： | M41T81M6 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SO-8 |
| 文件页数： | 3/27页 |
| 文件大小： | 388K |
| 代理商： | M41T81M6 |
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M41T81
CLOCK OPERATION
The 20-byte Register Map (see Table 2., page 12)
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.
Note: The Tenths/Hundredths of Seconds cannot
be written to any value other than “00.”
Bits D6 and D7 of Clock Register 03h (Century/
Hours Register) contain the CENTURY ENABLE
Bit (CEB) and the CENTURY Bit (CB). Setting
CEB to a '1' will cause CB to toggle, either from '0'
to '1' or from '1' to '0' at the turn of the century (de-
pending upon its initial state). If CEB is set to a '0,'
CB will not toggle. Bits D0 through D2 of Register
04h contain the Day (day of week). Registers 05h,
06h, and 07h contain the Date (day of month),
Month and Years. The ninth clock register is the
Control Register (this is described in the Clock
Calibration section). Bit D7 of Register 01h con-
tains the STOP Bit (ST). Setting this bit to a '1' will
cause the oscillator to stop. If the device is expect-
ed to spend a significant amount of time on the
shelf, the oscillator may be stopped to reduce cur-
rent drain. When reset to a '0' the oscillator restarts
within one second.
The eight Clock Registers may be read one byte at
a time, or in a sequential block. Provision has been
made to assure that a clock update does not occur
while any of the eight clock addresses are being
read. If a clock address is being read, an update of
the clock registers will be halted. This will prevent
a transition of data during the READ.
Power-down Time-Stamp
When a power failure occurs, the HT Bit will auto-
matically 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 TIMEKEEPER regis-
ters with the current time. For more information,
see Application Note AN1572.
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 BiPORT TIMEKEEPER cells). The
external copies are independent of internal func-
tions except that they are updated periodically by
the simultaneous transfer of the incremented inter-
nal copy. The internal divider (or clock) chain will
be reset upon the completion of a WRITE to any
clock address.
The system-to-user transfer of clock data will be
halted whenever the address being read is a clock
address (00h to 07h). The update will resume ei-
ther due to a Stop Condition or when the pointer
increments to any non-clock address (08h-13h).
TIMEKEEPER and Alarm Registers store data in
BCD. Control, Watchdog and Square Wave Reg-
isters store data in Binary Format.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M41T81M6E | 功能描述:实时时钟 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| M41T81M6F | 功能描述:实时时钟 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| M41T81M6F-CUT TAPE | 制造商:ST 功能描述:M41T Series 2 V Serial I2C Real Time Clock with Alarm - SOIC-8 |
| M41T81M6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Serial Access Real-Time Clock with Alarms |
| M41T81MX | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:SERIAL ACCESS RTC WITH ALARMS |
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