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CDCE62005 Datasheet(PDF) 24 Page - Texas Instruments |
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CDCE62005 Datasheet(HTML) 24 Page - Texas Instruments |
24 / 80 page 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 0 1 2 3 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 0 1 2 3 Address Bits (4) Lastin / Lastout FirstIn / FirstOut SPI _LE SPI_CLK SPI_MOSI SPI_MISO SPI_LE SPI_CLK SPI_MOSI SPI_MISO SPIMaster (Host) SPI _LE SPI _CLK SPI_MOSI SPI_MISO SPISlave (CDCE 62005) DeviceRegisterN 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 SPIRegister DataBits (28) CDCE62005 SCAS862C – NOVEMBER 2008 – REVISED FEBRUARY 2010 www.ti.com Figure 19. CDCE62005 SPI Communications Format CDCE62005 SPI Command Structure The CDCE62005 supports four commands issued by the Master via the SPI: • Write to RAM • Read Command • Copy RAM to EEPROM – unlock • Copy RAM to EEPROM – lock Table 5 provides a summary of the CDCE62005 SPI command structure. The host (master) constructs a Write to RAM command by specifying the appropriate register address in the address field and appends this value to the beginning of the data field. Therefore, a valid command stream must include 32 bits, transmitted LSB first. The host must issue a Read Command to initiate a data transfer from the CDCE62005 back to the host. This command specifies the address of the register of interest in the data field. Table 5. CDCE62005 SPI Command Structure Data Field (28 Bits) Addr Field (4 Bits) Register Operation NVM 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 9 8 7 6 5 4 3 2 1 0 3 2 1 0 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 0 Write to RAM Yes X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 0 0 0 1 Write to RAM Yes X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 0 0 1 2 Write to RAM Yes X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 0 1 0 3 Write to RAM Yes X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 0 1 1 4 Write to RAM Yes X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 1 0 0 5 Write to RAM Yes X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 1 0 1 6 Write to RAM Yes X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 1 1 0 7 Write to RAM Yes X X X X X X X X X X X X X X X X X X X X X X X X X X X X 0 1 1 1 8 Status/Control No X X X X X X X X X X X X X X X X X X X X X X X X X X X X 1 0 0 0 Instruction Read Command No 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 A A A A 1 1 1 0 Instruction RAM EEPROM Unlock 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 Instruction RAM EEPROM Lock (1) 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 1 1 1 1 1 1 (1) CAUTION: After execution of this command, the EEPROM is permanently locked. After locking the EEPROM, device configuration can only be changed via Write to RAM after power-up; however, the EEPROM can no longer be changed 24 Submit Documentation Feedback Copyright © 2008–2010, Texas Instruments Incorporated Product Folder Link(s) :CDCE62005 |
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