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M9356-DS6T bảng dữ liệu(PDF) 9 Page - STMicroelectronics |
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9 / 27 page M93C86, M93C76, M93C66, M93C56, M93C46 Connecting to the serial bus 9/37 2 Connecting to the serial bus Figure 3 shows an example of three memory devices connected to an MCU, on a serial 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. The pull-down resistor R (represented in Figure 3) ensures that no device is selected if the bus master leaves the S line in the high impedance state. In applications where the bus master may be in a state where all inputs/outputs are high impedance at the same time (for example, if the bus master is reset during the transmission of an instruction), the clock line (C) must be connected to an external pull-down resistor so that, if all inputs/outputs become high impedance, the C line is pulled low (while the S line is pulled low): this ensures that C does not become high at the same time as S goes low, and so, that the tSLCH requirement is met. The typical value of R is 100 kΩ. Figure 3. Bus master and memory devices on the serial bus AI14377b Bus master M93xxx memory device SDO SDI SCK CQD S M93xxx memory device CQD S M93xxx memory device CQD S CS3 CS2 CS1 ORG ORG ORG RR R VCC VCC VCC VCC VSS VSS VSS VSS R |
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