參數(shù)資料
型號(hào)： M41T65Q6F
廠商： STMICROELECTRONICS
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 1 TIMER(S), REAL TIME CLOCK, QCC16
封裝： 3 X 3 MM, LEAD FREE, QFN-16
文件頁(yè)數(shù)： 9/40頁(yè)
文件大小： 707K
代理商： M41T65Q6F
M41T62/63/64/65
Clock operation
Doc ID 10397 Rev 12
3
Clock operation
The M41T6x is driven by a quartz-controlled oscillator with a nominal frequency of
32.768 kHz. The accuracy of the real-time clock depends on the frequency of the quartz
crystal that is used as the time-base for the RTC.
The eight byte clock register (see
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.
A WRITE to any clock register will result in the tenths/hundredths of seconds being reset to
“00,” and tenths/hundredths of seconds cannot be written to any value other than “00.”
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
calibration register (this is described in the clock calibration section). Bit D7 of register 01h
contains the STOP bit (ST). Setting this bit to a '1' will cause the oscillator to stop. When
reset to a '0' the oscillator restarts within one second (typical).
Upon initial power-up, the user should set the ST bit to a '1,' then immediately reset the ST
bit to '0.' This provides an additional “kick-start” to the oscillator circuit.
Bit D7 of register 02h (minute register) contains the oscillator fail interrupt enable bit (OFIE).
When the user sets this bit to '1,' any condition which sets the oscillator fail bit (OF) (see
Oscillator stop detection on page 28) will also generate an interrupt output.
Bits D6 and D7 of clock register 06h (century/month register) contain the CENTURY bit 0
(CB0) and CENTURY bit 1 (CB1).
A WRITE to ANY location within the first eight bytes of the clock register (00h-07h),
including the OFIE bit, RS0-RS3 bit, and CB0-CB1 bits will result in an update of the system
clock and a reset of the divider chain. This could result in an inadvertent change of the
current time. These non-clock related bits should be written prior to setting the clock, and
remain unchanged until such time as a new clock time is also written.
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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41T65Q6F-CUT TAPE 制造商:ST 功能描述:M41T65 Series 1.3 to 4.4 V Serial I2C Real Time Clock Surface Mount - QFN-16
M41T66 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock with alarms
M41T66_11 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial real-time clock with alarms
M41T66Q6F 功能描述:實(shí)時(shí)時(shí)鐘 real-time clock with alarms 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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
M41T80 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SERIAL ACCESS RTC WITH ALARMS
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