M24LR16E-R datasheet(109/143 Pages) STMICROELECTRONICS

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M24LR16E-R

Command codes

Doc ID 018932 Rev 8

109/143

Response parameter:

●

Error code as Error_flag is set:

–

10h: the specified block is not available

–

15h: the specified block is 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 Single block command to the end of the M24LR16E-R response.

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

state.

26.18

Fast Inventory Initiated

Before receiving the Fast Inventory Initiated command, the M24LR16E-R must have

received an Initiate or a Fast Initiate command in order to set the Initiate_ flag. If not, the

M24LR16E-R does not answer to the Fast Inventory Initiated command.

The subcarrier_flag should be set to 0, otherwise the M24LR16E-R answers with an error

code.

On receiving the Fast Inventory Initiated request, the M24LR16E-R runs the anticollision

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

Table 29. The data rate of the response is multiplied by 2.

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 M24LR16E-R does not generate any answer in case of error.

Figure 70.

Fast Read Single Block frame exchange between VCD and M24LR16E-R

VCD

SOF

Fast Read Single

Block request

EOF

M24LR16E-R

<-t1-> SOF

Fast Read Single

Block response

EOF

Table 91.

Fast Inventory Initiated request format

Request

SOF

Request

_flags

Fast

Inventory

Initiated

IC Mfg

code

Optional

AFI

Mask

length

Mask value

CRC16

Request

EOF

8 bits

C1h

02h

8 bits

0 - 64 bits

16 bits

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