M24LR04E-R datasheet(112/142 Pages) STMICROELECTRONICS

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Command codes

M24LR04E-R

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Doc ID 022208 Rev 5

Response parameter:

●

Error code as Error_flag is set:

–

03h: the option is not supported

–

10h: block address not available

–

15h: block read-protected

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

starts the Fast Read Multiple Block command to the end of the M24LR04E-R response.

When configured in the RF write in progress mode, the RF WIP/BUSY pin remains in high-Z

state.

26.21

Inventory Initiated

Before receiving the Inventory Initiated command, the M24LR04E-R must have received an

Initiate or a Fast Initiate command in order to set the Initiate_ flag. If not, the M24LR04E-R

does not answer to the Inventory Initiated command.

On receiving the Inventory Initiated request, the M24LR04E-R runs the anticollision

sequence. The Inventory_flag must be set to 1. The meaning of flags 5 to 8 is given in

Table 29.

The request contains:

●

the flags,

●

the Inventory Command code,

●

the AFI if the AFI flag is set,

●

the mask length,

●

the mask value,

●

the CRC.

The M24LR04E-R does not generate any answer in case of error.

Table 97.

Fast Read Multiple Block response format when Error_flag is set

Response SOF

Response_flags

Error code

CRC16

Response EOF

8 bits

16 bits

Figure 72.

Fast Read Multiple Block frame exchange between VCD and M24LR04E-R

VCD

SOF

Fast Read

Multiple Block

request

EOF

M24LR04E-R

<-t1-> SOF

Fast Read

Multiple Block

response

EOF

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