DS2430A

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MEMORY FUNCTION FLOW CHART Figure 6 (cont’d)

READ APPLICATION REGISTER [C3h]

This command is used to read the application register or the register scratchpad. As long as the

application register is not yet locked, one will receive data from the register scratchpad. After the

application register is locked the DS2430A will transmit data from the application register, making the

register scratchpad inaccessible for reading. The contents of the status register indicate where the data

received with this command came from. After issuing the Read Application Register command, the

master must provide the 1-byte starting address from where data is to be read. The DS2430A will

automatically increment the address after every byte read by the master. After the data of address 07h has

been read, the address counter will wrap around to 00h for the next byte and reading continues until the

master sends a Reset Pulse.

COPY & LOCK APPLICATION REGISTER [5Ah]

After the data stored in the register scratchpad has been verified the master may send the Copy & Lock

Application Register command followed by a validation key of A5h to transfer the contents of the entire

register scratchpad to the application register and to simultaneously write-protect it. The master may

cancel this command by sending a Reset Pulse instead of the validation key. After the validation key was

transmitted, the application register will contain the data of the register scratchpad. Further write accesses

to the application register will be denied. The Copy & Lock Application Register command can only

be executed once.