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STA321MPL1 数据表(PDF) 14 Page - STMicroelectronics |
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STA321MPL1 数据表(HTML) 14 Page - STMicroelectronics |
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14 / 80 page  Microphone interface STA321MPL1 14/80 DocID029389 Rev 1 Figure 4. PDM clock generator 3.2 PDM resampling interface The PDM resampling interface is used to properly sample external data. It can work in three different modes: compatibility mode, dual-membrane mode and advanced mode. In each mode, data are sampled at the rising or falling edge. Table 8. Modes for PDM resampling interface Compatibility mode In this mode every channel is sampled at the rising edge. Dual-membrane mode The dual-membrane mode is a particular configuration (automatically applied when the proper bit is asserted) which permits the use of the dual-membrane microphone. In particular, it has 2 PDM data channels (normal and high) muxed in a single wire. The normal channel is sampled at the falling edge, while the high channel is sampled at the rising edge. Advanced mode In this mode every channel can be sampled at the rising or falling edge according to the configuration register. Mode Behavior 00 Compatibility (old) 01 Reserved 10 Dual-membrane 11 Advanced |
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