MAX66020K-000AA+【PDF 12/25 页】IC RFID UID 1KB TYPEB MEM KEYFOB

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ISO/IEC 14443 Type B-Compliant

1Kb Memory Fob

Request Information Field for the Write Single Block Command

COMMAND

21h

BLOCK NUMBER

(1 Byte)

NEW BLOCK DATA

(8 Bytes)

Request Information Field for the Lock Block Command

Command

22h

COMMAND

20h

Block Number

(1 Byte)

Request Information Field for the Read Single Block Command

BLOCK NUMBER

(1 Byte)

Response Information Field for the Read Single Block Command (No Error)

INDICATOR

00h

Write Single Block

The normal way to write data to the device is through

Write Single Block. This command uses one command-

specific parameter, which is the memory block number.

Valid block numbers are 00h to 11h. Writing a block

takes t PROG . If this command is processed without any

error, the response information field consists of an indi-

cator byte with the code 00h. The response is transmit-

ted after the memory is updated.

Depending on the protection settings of the memory

location to be updated, the MAX66020 manipulates

data as it arrives in a buffer. Upon receiving a Write

Single Block command for a write-protected location,

e.g., a self-locking nibble or byte in memory block 11h,

the buffer is loaded with the data already in memory,

rather than the data transmitted in the request.

Similarly, if the target memory block is in EPROM mode,

the buffer is loaded with the bitwise logical AND of the

transmitted data and data already in memory. In all

MEMORY DATA

(8 Bytes)

other cases, the data sent by the master arrives in the

buffer unaltered.

Lock Block

This command permanently locks (write protects) the

selected block and reports the success of the operation

in the response. Locking a block takes t PROG . If this

command is processed without any error, the response

information field consists of an indicator byte with the

code 00h. The response is transmitted after the protec-

tion byte is updated. The block protection can alterna-

tively be achieved by directly writing to memory block

11. Before using the Lock Block command, the final

block data should be defined and written to the device.

Read Single Block

This command allows for retrieving the data of a single

memory block. This command uses one command-spe-

cific parameter, which is the memory block number.

Valid block numbers are 00h to 11h.

12

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