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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M95320-BN3 датащи(PDF) 7 Page - STMicroelectronics |
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M95320-BN3 датащи(HTML) 7 Page - STMicroelectronics |
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7 / 42 page  7/42 M95640, M95320 CONNECTING TO THE SPI BUS These devices are fully compatible with the SPI protocol. All instructions, addresses and input data bytes are shifted in to the device, most significant bit first. The Serial Data Input (D) is sampled on the first rising edge of the Serial Clock (C) after Chip Select (S) goes Low. All output data bytes are shifted out of the device, most significant bit first. The Serial Data Output (Q) is latched on the first falling edge of the Serial Clock (C) after the instruction (such as the Read from Memory Array and Read Status Register in- structions) have been clocked into the device. Figure 4. shows three devices, connected to an MCU, on a SPI bus. Only one device is selected at a time, so only one device drives the Serial Data Output (Q) line at a time, all the others being high impedance. Figure 4. Bus Master and Memory Devices on the SPI Bus Note: The Write Protect (W) and Hold (HOLD) signals should be driven, High or Low as appropriate. AI03746e 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 HOLD W HOLD W HOLD RR R VCC VCC VCC VCC |
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