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M95128-WDW3V Datasheet(PDF) 11 Page - STMicroelectronics |
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M95128-WDW3V Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 41 page M95128, M95128-W, M95128-R Operating features 11/41 3.7.4 Power-down At Power-down, the device must be deselected and in Standby Power mode (that is, there should be no internal Write cycle in progress). Chip Select (S) should be allowed to follow the voltage applied on VCC. 4 Operating features 4.1 Hold condition The Hold (HOLD) signal is used to pause any serial communications with the device without resetting the clocking sequence. During the Hold condition, the Serial Data Output (Q) is high impedance, and Serial Data Input (D) and Serial Clock (C) are Don’t Care. To enter the Hold condition, the device must be selected, with Chip Select (S) Low. Normally, the device is kept selected, for the whole duration of the Hold condition. Deselecting the device while it is in the Hold condition, has the effect of resetting the state of the device, and this mechanism can be used if it is required to reset any processes that had been in progress. The Hold condition starts when the Hold (HOLD) signal is driven Low at the same time as Serial Clock (C) already being Low (as shown in Figure 4). The Hold condition ends when the Hold (HOLD) signal is driven High at the same time as Serial Clock (C) already being Low. Figure 4 also shows what happens if the rising and falling edges are not timed to coincide with Serial Clock (C) being Low. Figure 4. Hold condition activation AI02029D HOLD C Hold Condition Hold Condition |
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