DS2430A

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MEMORY FUNCTION FLOW CHART Figure 6 (cont’d)

WRITE APPLICATION REGISTER [99h]

This command is essentially the same as the Write Scratchpad command, but it addresses the 64-bit

register scratchpad. After issuing the command code, the master must provide a 1-byte address, followed

by the data to be written. The DS2430A will automatically increment the address after every byte it

received. After having received a data byte for address 07h, the address counter will wrap around to 00h

for the next byte and writing continues until the master sends a Reset Pulse. The Write Application

Register command can be used as long as the application register has not yet been locked. If issued for a

device with the application register locked, the data written to the register scratchpad will be lost.

READ STATUS REGISTER [66h]

The status register is a means for the master to find out if the application register has been programmed

and locked. After issuing the read status register command, the master must provide the validation key

00h before receiving status information. The two least significant bits of the 8-bit status register will be 0

if the application register was programmed and locked; all other bits will always read 1. The master may

finish the read status command by sending a Reset Pulse at any time.