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ST7540 数据表(PDF) 33 Page - STMicroelectronics |
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ST7540 数据表(HTML) 33 Page - STMicroelectronics |
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33 / 44 page ![]() ST7540 Functional description 33/44 Table 12. Control register functions Function Value Selection Note Default 0 to 2 Frequencies Bit2 Bit1 Bit0 60 KHz 66 KHz 72 KHz 76 KHz 82.05 KHz 86 KHz 110 KHz 132.5 KHz 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 132.5 kHz 3 to 4 Baud rate Bit 4 Bit 3 600 1,200 2,400 4,800 0 0 1 1 0 1 0 1 2400 5Deviation Bit 5 0.5 1 0 1 0.5 6 Watchdog Bit 6 Disabled Enabled (1.5 s) 0 1 Enabled 7 to 8 Transmission time out Bit 8 Bit 7 Disabled 1 s 3 s Not Used 0 0 1 1 0 1 0 1 1 sec 9 to 10 Frequency detection time Bit 10 Bit 9 500 µs 1 ms 3 ms 5 ms 0 0 1 1 0 1 0 1 1 ms 11 Reserved Do not force a different value 0 |
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