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ST7538 数据表(PDF) 23 Page - STMicroelectronics |
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ST7538 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 30 page ![]() 23/30 ST7538 Function Value Selection Note Default Bit 13 Bit 12 12 to 13 Detection Method Carrier detection without conditioning 0 0 Carrier Detection Notification on CD_PD Line CLR/T and RxD signal always Present Preamble detection without conditioning Carrier detection with conditioning 0 1 CLR/T and RxD lines are forced to “0” when Carrier is not detected Preamble detection without conditioning 1 0 Preamble Detection Notification on CD_PD Line CLR/T and RxD signal always Present Preamble detection with conditioning 1 1 Preamble Detection Notification on CD_PD Line CLR/T and RxD lines are forced to “0” when Preamble has not been detected or PLL is in Unlock condition Bit 14 14 Mains Interfacing Mode Synchronous Asynchronous 0 1 Asynchronous Bit 16 Bit 15 15 to 16 Output Clock 16 MHz 8 MHz 4 MHz Not Used 0 0 1 1 0 1 0 1 4 MHz Bit 18 Bit 17 17 to 18 Packet Mode Baud Rate Mclk/32 Mclk/64 Mclk/128 Mclk/256 0 0 1 1 0 1 0 1 MLCK/64 Bit 20 Bit 19 19 to 20 Packet Length 8 Bit 9 Bit 14 Bit 16 Bit 0 0 1 1 0 1 0 1 14 bits Bit 21 21 Packet Mode Enable Disabled Enabled 0 1 Disabled Bit 22 22 Sensitivity Mode Normal Sensitivity High Sensitivity 0 1 Normal Bit 23 23 Input Filter Disabled Enabled 0 1 Disabled Table 6. Control Register Functions (continued) |
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