M41T82RM6F STMicroelectronics, M41T82RM6F Datasheet - Page 37

• Manufacturer Part Number: M41T82RM6F
• Description: IC RTC SERIAL W/BATT SW 8-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Alarmr

Specifications of M41T82RM6F

• Memory Size: 32B
• Time Format: HH:MM:SS:hh (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8279-2; M41T82RM6F

M41T82-M41T83
3.8.2
3.8.3
3.8.4
3.8.5
3.9
Note:
Timer flag (TF)
At the end of a timer countdown, when the timer reloads, TF is set to logic '1.' Regardless of
the state of TF bit (or TI/TP bit), the timer will continue decrementing and reloading.
If both timer and alarm interrupts are used in the application, the source of the interrupt can
be determined by reading the flag bits. Refer to
interaction of these bits. The TF bit is cleared by reading the flags register. This will de-
assert an interrupt output due to the timer.
Timer interrupt enable (TIE, M41T83 only)
In normal interrupt mode (TI/TP = 0), when TF is asserted, the interrupt output is asserted (if
TIE = 1). To de-assert the interrupt, the TF bit or the TIE bit must be reset. Disabling the
interrupt by clearing the TIE bit will de-assert the output, but does not clear the TF bit. Thus,
if TIE is re-enabled prior to clearing TF, the interrupt will assert immediately.
Timer enable (TE)
●
●
TD1/0
These are the timer source clock frequency selection bits (see
determine the source clock for the countdown timer (see
use, the TD1 and TD0 bits should be set to 11 (1/60 Hz) for power saving.
Table 12.
Square wave output
The M41T83 offers the user a programmable square wave function which is output on the
SQW pin. RS3-RS0 bits located in 13h establish the square wave output frequency. These
frequencies are listed in
completed, the SQW pin can be turned on and off under software control with the square
wave enable bit (SQWE) located in register 0Ah.
If the SQWE bit is set to '1' and V
wave output will be disabled.
TE = 0
When the timer register (10h) is set to 0, the timer is disabled.
TE = 1
The timer is enabled. TE is reset (disabled) on power-down. When re-enabled, the
counter will begin counting from the same value as when it was disabled.
TD1
0
0
1
1
Timer source clock frequency selection (244.1 µs to 4.25 hrs)
Table
Doc ID 12578 Rev 12
13. Once the selection of the SQW frequency has been
(M41T83 only)
TD0
CC
0
1
0
1
falls below the switchover (V
Section 3.14
Timer source clock frequency (Hz)
Table 10 on page
for more information on the
4096 (244.1 µs)
Table
64 (15.6 ms)
1/60 (60 s)
SO
1 (1 s)
) voltage, the square
12). These bits
Clock operation
36). When not in
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