ST25TB02K datasheet(29/47 Pages) STMICROELECTRONICS

29 / 47 page

8.7

Read_block(Addr) command

Command code = 08h

On receiving the Read_block command, the ST25TB02K reads the desired block and returns the 4 data bytes

contained in the block. Data bytes are transmitted with the least significant byte first and each byte is transmitted

with the least significant bit first.

The address byte gives access to the 64 blocks of the ST25TB02K (addresses 0 to 63). Read_block commands

issued with a block address above 63 will not be interpreted and the ST25TB02K will not return any response,

except for the System area located at address 255.

The ST25TB02K must have received a Select() command and be switched to Selected state before any

Read_block() command can be accepted. All Read_block() commands sent to the ST25TB02K before a Select()

command is issued are ignored.

Figure 36. Read_block request format

SOF

Read_block

CRCL

EOF

08h

8 bits

Address

CRCH

Request parameter:

•

Address: block addresses from 0 to 63, or 255

Figure 37. Read_block response format

SOF

Data 1

CRCL

EOF

8 bits

CRCH

8 bits

Data 2

Data 3

Data 4

Response parameters:

•

Data 1: Less significant data byte

•

Data 2: Data byte

•

Data 3: Data byte

•

Data 4: Most significant data byte

Figure 38. Read_block frame exchange between reader and ST25TB02K

Data 1 Data 2 Data 3 Data 4

Reader

ST25TBxxx

<-t0-><-t1->

08h

Address

CRCL CRCH

ST25TB02K

Read_block(Addr) command

DS11469 - Rev 7

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