ST25TB02K datasheet(30/47 Pages) STMICROELECTRONICS

30 / 47 page

8.8

Write_block (Addr, Data) command

Command code = 09h

On receiving the Write_block command, the ST25TB02K writes the 4 bytes contained in the command to the

addressed block, provided that the block is available and not write-protected. 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). Write_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 result of the Write_block command is submitted to the addressed block. See the following tables for a

complete description of the Write_block command:

•

Table 4. Resettable OTP area (addresses 0 to 4)

•

Table 6. Binary counter (addresses 5 to 6)

•

Table 5. EEPROM area (addresses 7 to 63)

The Write_block command does not give rise to a response from the ST25TB02K. The reader must check after

the programming time, tW, that the data was correctly programmed. The ST25TB02K must have received a

Select() command and be switched to Selected state before any Write_block command can be accepted. All

Write_block commands sent to the ST25TB02K before a Select() command is issued, are ignored.

Figure 39. Write_block request format

SOF

Data 1

CRCL

EOF

8 bits

CRCH

8 bits

Data 2 Data 3

Data 4

Write_block

Address

09h

8 bits

•

Request parameters:

•

Address: block addresses from 0 to 63, or 255

•

Data 1: Less significant data byte

•

Data 2: Data byte

•

Data 3: Data byte

•

Data 4: Most significant data byte.

Figure 40. Write_block response format

No Response

Figure 41. Write_block frame exchange between reader and ST25TB02K

SOF

09h

EOF

Reader

ST25TBxxx

CRCL CRCH

Data 1 Data 2 Data 3

Address

No Response

Data 4

ST25TB02K

Write_block (Addr, Data) command

DS11469 - Rev 7

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