ST25DV64K datasheet(156/220 Pages) STMICROELECTRONICS

156 / 220 page

RF operations

ST25DV04K ST25DV16K ST25DV64K

156/220

DocID027603 Rev 4

7.6.36

Present Password

On receiving the Present Password command, the ST25DVxxx compares the requested

password with the data contained in the request and reports if the operation has been

successful in the response. Refer to Section 5.6: Data Protection for details on password

Management. After a successful command, the security session associate to the password

is open as described in Section 5.6: Data Protection.

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

Request parameter:

•

Request flags

•

UID (optional)

•

Password Number (00h = Password configuration, 0x01 = Pswd1, 0x02 = Pswd2, 0x03

= Pswd3, other = Error)

•

Password

Response parameter:

•

No parameter. The response is sent back after the write cycle.

Figure 64. Write Password frame exchange between VCD and ST25DVxxx

VCD

SOF

Write

Password

request

EOF

ST25DVxxx

<-t1-> SOF

Write

Password

response

EOF

Write sequence

when error

ST25DVxxx

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

Write

Password

response

EOF

Table 171. Present Password request format

Request

SOF

Request

_flags

Present

Password

IC Mfg

code

UID(1)

1. Gray color means that the field is optional.

Password

number

Password

CRC16

Request

EOF

-8 bits

B3h

02h

64 bits

8 bits

64 bits

16 bits

Table 172. Present Password response format when Error_flag is NOT set

Response

SOF

Response_flags

CRC16

Response

EOF

8 bits

16 bits

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