ST25DV64K datasheet(118/220 Pages) STMICROELECTRONICS

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RF operations

ST25DV04K ST25DV16K ST25DV64K

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DocID027603 Rev 4

Response parameter:

•

Error code as Error_flag is set:

–

03h: command option not supported

–

0Fh: error with no information given

–

10h: the specified block is not available

–

12h: the specified block is locked and its contents cannot be changed

–

13h: the specified block was not successfully programmed

7.6.10

Lock block

On receiving the Lock block request, the ST25DVxxx locks the single block value

permanently and protects its content against new writing.

This command is only applicable for the blocks 0 and 1 which may include a CC file.

For a global protection of a area, update accordingly the RFAiSS bits in the system area.

The Option_flag is supported, when set wait for EOF to respond.

The Inventory_flag must be set to 0.

During the RF write cycle Wt, there should be no modulation (neither 100% nor 10%),

otherwise the ST25DVxxx may not lock correctly the single block value in memory. The Wt

time is equal to t1nom + N × 302 µs (N is an integer).

Table 81. Extended Write Single response format when Error_flag is set

Response

SOF

Response_flags

Error code

CRC16

Response

EOF

8 bits

16 bits

Figure 38. Extended Write Single frame exchange between VCD and ST25DVxxx

VCD

SOF

Extended Write

Single request

EOF

ST25DVxxx

<-t1-> SOF

Extended Write

Single response

EOF

Write sequence when

error

ST25DVxxx

<------------------- Wt ---------------> SOF

Extended Write

Single response

EOF

Table 82. Lock block request format

Request

SOF

Request_flags Lock block

UID(1)

1. Gray color means that the field is optional.

block

number

CR7C16

Request

EOF

8 bits

22h

64 bits

8 bits

16 bits

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