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參數(shù)資料
| 型號： | M41T83ZM6E |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復及定時提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封裝： | 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 11/61頁 |
| 文件大?。?/td> | 983K |
| 代理商： | M41T83ZM6E |
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M41T82-M41T83
Clock operation
Doc ID 12578 Rev 12
3
Clock operation
The M41T8x 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 8-byte clock register (see Table 2 on page 21 and Table 4 on page 23) is used to both
set the clock and to read the date and time from the clock, in binary coded decimal format.
Tenths/hundredths of seconds, seconds, minutes, and hours are contained within the first
four registers.
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).
Note:
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.
Bits D6 and D7 of clock register 03h (century/ hours register) contain the CENTURY bit 0
(CB0) and CENTURY bit 1 (CB1). 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 digital calibration register, while the analog calibration register is
found at address 12h (these are both described in Section 3.4: Clock calibration). The RTC
includes an oscillator fail detect circuit which sets the OF bit in the flags register (bit 2,
register 0fh). For the M41T83, bit D7 of register 09h (watchdog register) contains the
oscillator fail interrupt enable bit (OFIE) which can be used to enable an interrupt when the
OF bit is set (see Section 3.12: Oscillator fail detection on page 40) will also generate an
interrupt output.
Note:
A WRITE to ANY location within the first eight bytes of the clock register (00h-07h),
including the ST bit and CB0-CB1 bits will result in an update of the RTC counters and a
reset of the divider chain. This could result in an inadvertent change of the current time. For
example, the ST bit is in the seconds register (address 01h) and the century bits (CB0-CB1)
are in the hours register (address 03h), so the user should take care to not alter these other
parameters when changing the ST bit or the century bits.
The eight clock registers may be read one byte at a time or in a sequential block. At the start
of a read cycle, a copy of the time/date counters is placed in the buffer/transfer registers and
can then be transferred out sequentially without concern that the time/date increments
during the transfer and thus yields a corrupt value. For example, if the user were to read the
seconds register, then start another bus cycle to read the minutes register, the minutes
counter could have incremented during the time between the two read cycles. The seconds
and minutes values would not be from the same instant in time; they would not be coherent.
By using the sequential read feature, the values shifted out are from the same instant in time
and are thus coherent.
Similarly, when writing to the RTC registers, during one write cycle, the user can
sequentially transfer all eight bytes of time/date into the buffer/transfer registers whereupon
they will be loaded simultaneously into the RTC counters thus ensuring a coherent update
of the time/date.
相關(guān)PDF資料 |
PDF描述 |
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| M41T83ZQA6E | 1 TIMER(S), REAL TIME CLOCK, QCC16 |
| M41T83RMY6E | 1 TIMER(S), REAL TIME CLOCK, PDSO18 |
| M41T83ZQA6F | 1 TIMER(S), REAL TIME CLOCK, QCC16 |
| M41T82SM6E | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T83ZMY6E | 1 TIMER(S), REAL TIME CLOCK, PDSO18 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41T83ZM6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover |
| M41T83ZMY6E | 功能描述:實時時鐘 Serial I2C bus RTC 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41T83ZMY6F | 功能描述:實時時鐘 Serial I2C bus RTC 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41T83ZQ6E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover |
| M41T83ZQ6F | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover |
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