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M41T93 Datasheet(PDF) 31 Page - STMicroelectronics

No. de pieza M41T93
Descripción Electrónicos  Serial SPI bus RTC with battery switchover
PDF  51 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T93 Datasheet(HTML) 31 Page - STMicroelectronics

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M41T93
Clock operation
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3.8.5
TD1/0
These are the timer source clock frequency selection bits (see Table 9). These bits
determine the source clock for the countdown timer (see Table 10). When not in use, the
TD1 and TD0 Bits should be set to ‘11’ (1/60Hz) for power saving.
Note:
Writing to the timer register will not reset the TF Bit or clear the interrupt.
Table 9.
Timer source clock frequency selection (244.1µs to 4.25 hrs)
TD1
TD0
Timer source clock frequency (Hz)
0
0
4096 (244.1µs)
0
1
64 (15.6ms)
10
1 (1s)
1
1
1/60 (60s)
Table 10.
Timer countdown value register bits (addr 11h)
Bit
Symbol
Description
7 - 0
<timer countdown
value>
This register holds the loaded countdown value ‘n.’
Countdown Period = n / Source Clock frequency.



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