m41t93 STMicroelectronics, m41t93 Datasheet - Page 31

• Manufacturer Part Number: m41t93
• Description: Serial Spi Bus Rtc With Battery Switchover
• Manufacturer: STMicroelectronics

3.8.5
Note:
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’ (1/60Hz) 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 (244.1µs to 4.25 hrs)
Timer countdown value register bits (addr 11h)
0
0
1
1
<timer countdown
Symbol
value>
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 (244.1µs)
64 (15.6ms)
1/60 (60s)
9). These bits
1 (1s)
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