ST25DV64KC datasheet(126/203 Pages) STMICROELECTRONICS

126 / 203 page

The subcarrier_flag should be set to 0, otherwise the ST25DVxxKC answers with an error code. The Option_flag

is not supported, and the Inventory_flag must be set to 0.

Table 208. Fast Read Message request format

Request

SOF

Request_flags

Fast Read

Message

IC Mfg

code

UID(1) MBpointer

Number of

Bytes

CRC16

Request

EOF

8 bits

CCh

02h

64 bits

8 bits

16 bits

1. This field is optional

Request parameters:

•

Request flag

•

UID (Optional)

•

Pointer (start at 00h)

•

Number of bytes is one less than the requested data

Table 209. 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 69. Fast Read Message frame exchange between VCD and ST25DVxxKC

SOF

Fast Read

Message request

VCD

ST25DVxxKC

EOF

SOF

Fast Read

Message response

EOF

7.6.35

Write Password

On receiving the Write Password command, the ST25DVxxKC 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

ST25DVxxKC may not correctly program the data into the memory.

ST25DV04KC ST25DV16KC ST25DV64KC

RF commands

DS13519 - Rev 3

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