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PCF7930/31/35
Memory organisation
Memory structure
Control memory flags of block 0
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Password (Bytes 0..6)
The password is 56 bits long. If the pasword function has been ativated by the PAC flag, the pattern being written in this area must be transmitted by the base station with every program command.
PCF7930/31/35 1
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Password Active Flag PAC (Byte 7)
If PAC flag = 1 , date send to the transponder is checked for correctness of the password.
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Block write Protection BWP (Byte 8)
Each block of the user date can be separatelu protected agains programming by setting the block write protection.
Control memory flags of block 1
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Sync_pattern (Bytes 16..23)
In these 8 bytes any type of data can be stored.
PCF7931 Datasheet
