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M25P20 Datasheet(PDF) 9 Page - Numonyx B.V |
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M25P20 Datasheet(HTML) 9 Page - Numonyx B.V |
9 / 50 page M25P20 SPI modes 9/50 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 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 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. 2. These pull-up resistors, R, ensure that the memory devices are 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 (e.g.: 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, S is pulled High while C 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). AI12836 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 R(2) R(2) R(2) VCC VCC VCC VCC VSS VSS VSS VSS R(2) |
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