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CDCE62002 Datasheet(PDF) 20 Page - Texas Instruments |
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CDCE62002 Datasheet(HTML) 20 Page - Texas Instruments |
20 / 49 page CDCE62002 SPI Command Structure CDCE62002 SCAS882A – JUNE 2009 – REVISED JULY 2009.............................................................................................................................................................. www.ti.com The CDCE62002 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 6 provides a summary of the CDCE62002 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 CDCE62002 back to the host. This command specifies the address of the register of interest in the data field. Table 6. CDCE62002 SPI Command Structure Data Field (28 Bits) Addr Field (4 BIts) 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 Register Operation NVM 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 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 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 0 0 1 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. 20 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): CDCE62002 |
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