MB89R112 datasheet(23/49 Pages) RAMXEED

23 / 49 page

MB89R112

DS411-00004-3v0-E

2. Description of Optional Commands

2-1. Read Single Block command

On receiving the Read Single Block command, the transponder reads the data stored in the specified single

block to the reader/writer.

If the Option_flag (bit 7) is “1”, the transponder adds block security status information in the response. If the

Option_flag (bit 7) is “0”, the transponder returns only the data in the specified block to the reader/writer.



Request

[Request from the reader/writer to the transponder]



Response

[Response from the transponder to the reader/writer]

(1) When Error_flag set

(2) When Error_flag not set

2-2. Write Single Block command

On receiving the Write Single Block command, the transponder writes the single block data included in the

request to the specified block.

The transponder performs verification after writing and returns an error code if the writing has failed.

If the Option_flag (bit 7) is “0”, the transponder shall return its response when it has completed the write

operation starting after “t1nom (320.9 s) + a multiple of 4096/fc (302.1 s)” with total tolerance of  32/fc

(2.4 s) and latest within 20 ms. If it is “1”, transponder shall wait for the reception of an EOF from the reader/

writer and upon such reception still return its response (However, if an EOF is not sent within 38 ms, the

time-out occurs and the transponder can receive another command).



Request

[Request from the reader/writer to the transponder]

SOF

Flag

Command

(Read Single Block)

UID

(Addressed mode)

Number of

blocks

CRC

EOF

8 bits

8 bits (“20H”)

64 bits

8 bits

16 bits

SOF

Flag

Error code

CRC

EOF

8 bits (“01H”)

8 bits

16 bits

SOF

Flag

Block security status (option)

Data

CRC

EOF

8 bits (“00H”)

8 bits

256 bits

16 bits

SOF

Flag

Command

(Write Single Block)

UID

(Addressed mode)

Number

of blocks

Data

CRC

EOF

8 bits

8 bits (“21H”)

64 bits

8 bits

256 bits

16 bits

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