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M25P80-VMP3G Datasheet(PDF) 10 Page - Numonyx B.V |
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M25P80-VMP3G Datasheet(HTML) 10 Page - Numonyx B.V |
10 / 52 page SPI modes M25P80 10/52 3 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 4, is the clock polarity when the bus master is in Standby mode and not transferring data: ● C remains at 0 for (CPOL=0, CPHA=0) ● C remains at 1 for (CPOL=1, CPHA=1) Figure 3. 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. Figure 3 shows an example of three devices connected to an MCU, on an SPI bus. Only one device is selected at a time, so only one device drives the Serial Data Output (Q) line at a time, the other devices are high impedance. Resistors R (represented in Figure 3) ensure that the M25P80 is not selected if the Bus Master leaves the S line in the high impedance state. As the Bus Master may enter a state where all inputs/outputs are in high impedance at the same time (for example, when the Bus Master is reset), the clock line (C) must be connected to an external pull-down resistor so that, when all inputs/outputs become high impedance, the S line is pulled High while the C line is pulled Low (thus ensuring that S and C do not become High at the same time, and so, that the tSHCH requirement is met). The typical value of R is 100 k Ω, assuming that the time constant R*Cp (Cp = parasitic capacitance of the bus line) is shorter than the time during which the Bus Master leaves the SPI bus in high impedance. AI12836b SPI Bus Master 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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