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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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M45PE40-VMP6TP Datenblatt(PDF) 6 Page - STMicroelectronics |
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M45PE40-VMP6TP Datenblatt(HTML) 6 Page - STMicroelectronics |
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6 / 35 page  M45PE40 6/35 SPI MODES These devices can be driven by a microcontroller with its SPI peripheral running in either of the two following modes: – CPOL=0, CPHA=0 – CPOL=1, CPHA=1 For these two modes, input data is latched in on the rising edge of Serial Clock (C), and output data is available from the falling edge of Serial Clock (C). The difference between the two modes, as shown in Figure 5., is the clock polarity when the bus master is in Stand-by mode and not transferring data: – C remains at 0 for (CPOL=0, CPHA=0) – C remains at 1 for (CPOL=1, CPHA=1) Figure 4. Bus Master and Memory Devices on the SPI Bus Note: The Write Protect (W) signal should be driven, High or Low as appropriate. Figure 5. SPI Modes Supported AI04043B Bus Master (ST6, ST7, ST9, ST10, Others) SPI Memory Device SDO SDI SCK CQD S SPI Memory Device CQD S SPI Memory Device CQD S CS3 CS2 CS1 SPI Interface with (CPOL, CPHA) = (0, 0) or (1, 1) W RP W RP W RP AI01438B C MSB CPHA D 0 1 CPOL 0 1 Q C MSB |
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