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FDC37C78-HT Datasheet(PDF) 59 Page - Microchip Technology |
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FDC37C78-HT Datasheet(HTML) 59 Page - Microchip Technology |
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59 / 82 page  59 Once awake, the FDC37C78 will reinitiate the auto powerdown timer for 10 ms. The part will powerdown again when all the powerdown conditions are satisfied. Register Behavior Table 30 reiterates the AT registers available. It also shows the type of access permitted. In order to maintain software transparency, access to all the registers must be maintained. As Table 30 shows, two sets of registers are distinguished based on whether their access results in the part remaining in powerdown state or exiting it. Access to all other registers is possible without awakening the part. These registers can be accessed during powerdown without changing the status of the part. A read from these registers will reflect the true status as shown in the register description in the FDC description. A write to the part will result in the part retaining the data and subsequently reflecting it when the part awakens. Accessing the part during powerdown may cause an increase in the power consumption by the part. The part will revert back to its low power mode when the access has been completed. Pin Behavior The FDC37C78 is specifically designed for portable PC systems in which power conservation is a primary concern. This makes the behavior of the pins during powerdown very important. The pins of the FDC37C78 can be divided into two major categories: system interface and floppy disk drive interface. The floppy disk drive pins are disabled so that no power will be drawn through the part as a result of any voltage applied to the pin within the part's power supply range. Most of the system interface pins are left active to monitor system accesses that may wake up the part. System Interface Pins Table 31 gives the state of the system interface pins in the powerdown state. Pins unaffected by the powerdown are labeled "Unchanged". Input pins are "Disabled" to prevent them from causing currents internal to the FDC37C78 when they have indeterminate input values. |
Similar Part No. - FDC37C78-HT |
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Similar Description - FDC37C78-HT |
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