M41T11MH6 STMicroelectronics, M41T11MH6 Datasheet - Page 14

• Manufacturer Part Number: M41T11MH6
• Description: Real Time Clock Serial 512 (64x8)
• Manufacturer: STMicroelectronics

Specifications of M41T11MH6

• Function: Clock, Calendar, Timekeeper
• Rtc Memory Size: 64 B
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial
• Package / Case: SO-28
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Clock operation
3
Note:
Note:
14/30
Clock operation
The eight byte clock register (see
and time from the clock, in a binary coded decimal format. Seconds, minutes, and hours are
contained within the first three registers. Bits D6 and D7 of clock register 2 (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
(depending upon its initial state). If CEB is set to a '0', CB will not toggle. Bits D0 through D2
of register 3 contain the day (day of week). Registers 4, 5 and 6 contain the date (day of
month), month and years. The final register is the control register (this is described in the
clock calibration section). Bit D7 of register 0 contains the STOP bit (ST). Setting this bit to a
'1' will cause the oscillator to stop. If the device is expected 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 restarts within one second.
In order to guarantee oscillator startup after the initial power-up, set the ST bit to a '1,' then
reset this bit to a '0.' This sequence enables a “kick start” circuit which aids the oscillator
startup during worst case conditions of voltage and temperature.
The seven clock registers may be read one byte at a time, or in a sequential block. The
control register (address location 7) may be accessed independently. 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 registers will be
delayed by 250 ms to allow the read to be completed before the update occurs. This will
prevent a transition of data during the read.
This 250 ms delay affects only the clock register update and does not alter the actual clock
time.
Table
3) is used to both set the clock and to read the date
M41T11