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L9779WD 数据表(PDF) 131 Page - STMicroelectronics |
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L9779WD 数据表(HTML) 131 Page - STMicroelectronics |
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131 / 170 page ![]() DocID027452 Rev 5 131/170 L9779WD Functional description 169 The commands that perform a read access to the L9779WD-data always initiate 4 registers to be sent by the L9779 to the µC. Within the execution of these read commands an upstream data frame is sent after the 2 stop bits of the prior upstream data frame and one additional inter-frame bit waiting time. If a new read command is received while the 4 registers up-stream communication is active, the 16 bit up-stream on-going is completed and after the inter-frame bit it is sent the new 4 register up-stream sequence requested. With the beginning of the upstream frame the latched flags contained in the register are cleared automatically. The time from the read command to the first upstream frame of the answer is less than 100µs. The end of the upstream frame is after 17 x 4 tUSC. Outside the upstream frame the DO output is high impedance. Figure 80. Upstream communication diagram Timing characteristics Figure 81. Timing diagram |
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