M41T93 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

M41T93

Serial SPI bus RTC with battery switchover

STMicroelectronics 

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M41T93

Clock operation

3.8.5

Note:

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.

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)

1

0

1

1

1 (1s)

1/60 (60s)

Table 10. Timer countdown value register bits (addr 11h)

Bit

Symbol

Description

7-0

<timer countdown This register holds the loaded countdown value ‘n.’

value>

Countdown Period = n / Source Clock frequency.

Writing to the timer register will not reset the TF Bit or clear the interrupt.

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