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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD9548/PCBZ датащи(PDF) 59 Page - Analog Devices |
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AD9548/PCBZ датащи(HTML) 59 Page - Analog Devices |
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59 / 112 page  AD9548 Rev. 0 | Page 59 of 112 REGISTER ACCESS RESTRICTIONS Read and write access to the register map may be restricted depending on the register in question, the source and direction of access, and the current state of the device. Each register can be classified into one or more access types. When more than one type applies, the most restrictive condition that applies at the moment is used. Whenever access is denied to a register, all attempts to read the register return a 0 byte, and all attempts to write to the register are ignored. Access to nonexistent registers is handled in the same way as for a denied register. Regular Access Registers with regular access do not fall into any other category. Both read and write access to registers of this type can be from either the serial ports or EEPROM controller. However, only one of these sources can have access to a register at any given time (access is mutually exclusive). Whenever the EEPROM controller is active, either in load or store mode, it has exclusive access to these registers. Read-Only Access An R in the Opt column of the register map identifies read-only registers. Access is available at all times, including when the EEPROM controller is active. Exclusion from EEPROM Access An E in the Opt column of the register map identifies a register with contents that are inaccessible to the EEPROM. That is, the contents of this type of register cannot be transferred directly to the EEPROM or vice versa. Note that read-only registers (R) are inaccessible to the EEPROM, as well. |
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