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M95256-W Datasheet(PDF) 24 Page - STMicroelectronics |
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M95256-W Datasheet(HTML) 24 Page - STMicroelectronics |
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24 / 43 page  Delivery state M95256, M95256-W, M95256-R 24/43 6 Delivery state The device is delivered with the memory array set at all 1s (FFh). The Status Register Write Disable (SRWD) and Block Protect (BP1 and BP0) bits are initialized to 0. 7 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 instructions) have been clocked into the device. Figure 12 shows an example of three memory devices connected to an MCU, on an SPI bus. Only one memory device is selected at a time, so only one memory device drives the Serial Data output (Q) line at a time, the other memory devices are high impedance. Figure 12. Bus master and memory devices on the SPI bus 1. The Write Protect (W) and Hold (HOLD) signals should be driven, high or low as appropriate. The pull-up resistor R (represented in Figure 12) ensures that a device is not selected if the bus master leaves the S line in the high-impedance state. In applications where the bus master might enter a state where all SPI bus inputs/outputs would be in high impedance at the same time (for example, if the bus master is reset during AI12304b 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 VSS VSS VSS VSS R |
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Similar Description - M95256-W |
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