M24LR16E-R datasheet(118/143 Pages) STMICROELECTRONICS

118 / 143 page

Command codes

M24LR16E-R

118/143

Doc ID 018932 Rev 8

When configured in the RF busy mode, the RF WIP/BUSY pin is tied to 0 from the SOF that

starts the WriteEHCfg command to the end of the M24LR16E-R response.

When configured in the RF write in progress mode, the RF WIP/BUSY pin is tied to 0 for the

entire duration of the internal write cycle (from the end of a valid WriteEHCfg command to

the beginning of the M24LR16E-R response).

26.25

WriteDOCfg

On receiving the WriteDOCfg command, the M24LR16E-R writes the data contained in the

request to the Configuration byte and reports whether the write operation was successful in

the response. The Protocol_extension_flag should be set to 0 for the M24LR16E-R to

operate correctly. If the Protocol_extension_flag is at 1, the M24LR16E-R answers with an

error code.

The Option_flag is supported, the Inventory_flag is not supported.

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

otherwise, the M24LR16E-R may not program correctly the data into the Configuration byte.

The Wt time is equal to t1nom + 18 × 302 µs.

Request parameters:

●

Request flag

●

UID (optional)

●

Data: during a WriteDOCfg command, bits 2 to 0 of the data are ignored (see

Table 14).

Figure 75.

WriteEHCfg frame exchange between VCD and M24LR16E-R

VCD

SOF

WriteEHCfg

request

EOF

M24LR16E-

<-t1-> SOF

WriteEHCfg

response

EOF

WriteEHCfg sequence

when error

M24LR16E-

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

WriteEHCfg

response

EOF

Table 109.

WriteDOCfg request format

Request

SOF

Request_

flags

WriteDOCfg

IC Mfg

code

UID(1)

Gray means that the field is optional.

Data

CRC16

Request

EOF

8 bits

A4h

02h

64 bits

8 bits

16 bits

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