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M41T93 数据表(PDF) 31 Page - STMicroelectronics |
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M41T93 数据表(HTML) 31 Page - STMicroelectronics |
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31 / 51 page  M41T93 Clock operation 31/51 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’ (1/60 Hz) 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 (244.1 µs to 4.25 hrs) TD1 TD0 Timer source clock frequency (Hz) 0 0 4096 (244.1 µs) 0 1 64 (15.6 ms) 10 1 (1 s) 1 1 1/60 (60 s) 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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