M41T93_11 STMICROELECTRONICS [STMicroelectronics], M41T93_11 Datasheet - Page 32
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M41T93_11
Manufacturer Part Number
M41T93_11
Description
Serial SPI bus real-time clock with battery switchover
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.M41T93_11.pdf
(51 pages)
- Current page: 32 of 51
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Clock operation
3.8.5
Note:
32/51
TD1/0
These are the timer source clock frequency selection bits (see
determine the source clock for the countdown timer (see
TD1 and TD0 bits should be set to ‘11’ (1/60 Hz) for power saving.
Table 9.
Table 10.
Writing to the timer register will not reset the TF bit or clear the interrupt.
7 - 0
Bit
TD1
Timer source clock frequency selection (244.1 µs to 4.25 hrs)
Timer countdown value register bits (addr 11h)
0
0
1
1
<timer countdown value>
Symbol
Doc ID 12615 Rev 6
TD0
0
1
0
1
This register holds the loaded countdown value ‘n.’
Countdown period = n / source clock frequency
Timer source clock frequency (Hz)
Table
Description
Table
10). When not in use, the
4096 (244.1 µs)
64 (15.6 ms)
1/60 (60 s)
9). These bits
1 (1 s)
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