ST25DV64K datasheet(123/200 Pages) STMICROELECTRONICS

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•

UID (Optional)

•

Pointer (start at 00h)

•

Number of bytes is one less than the requested data

Table 206. Fast Read Message response format when Error_flag is NOT set

Response SOF

Response_flags

Mailbox content

CRC16

Response EOF

8 bits

(Number of bytes + 1) bytes(1)

16 bits

64 bits

1. Number of message Bytes when Number of Bytes is set to 00h

Response parameters:

•

(number of bytes + 1) data bytes

Response parameter:

•

Error code as Error_flag is set:

–

02h: command not recognized

–

03h: command option not supported

–

0Fh: error with no information given

Figure 63. Fast Read Message frame exchange between VCD and ST25DVxxx

SOF

Fast Read

Message request

VCD

ST25DVxxx

EOF

SOF

Fast Read

Message response

EOF

7.6.35

Write Password

On receiving the Write Password command, the ST25DVxxx uses the data contained in the request to write

the password and reports whether the operation was successful in the response. It is possible to modify a

Password value only after issuing a valid Present password command (of the same password number). When

the Option_flag is set, wait for EOF to respond. Refer to Section 5.6 Data Protection for details on password

Management. The Inventory_flag must be set to 0.

During the RF write cycle time, Wt, there must be no modulation at all (neither 100% nor 10%), otherwise the

ST25DVxxx may not correctly program the data into the memory.

The Wt time is equal to t1nom + N × 302 µs (N is an integer). After a successful write, the new value of the

selected password is automatically activated. It is not required to present the new password value until the

ST25DVxxx power-down.

Caution:

If ST25DVxxx is powered through VCC, removing VCC during Write Password command can abort the

command. As a consequence, before writing a new password, RF user should check if VCC is ON, by reading

EH_CTRL_Dyn register bit 3 (VCC_ON), and eventually ask host to maintain or to shut down VCC, during the

Write Password command in order to avoid password corruption.

To make the application more robust, it is recommended to use addressed or selected mode during write

password operations to get the traceability of which tags/UID have been programmed

ST25DV04K ST25DV16K ST25DV64K

RF commands

DS10925 - Rev 9

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