M24LR64E-R datasheet(109/140 Pages) STMICROELECTRONICS

109 / 140 page

M24LR64E-R

Command codes

Doc ID 022712 Rev 3

109/140

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

starts the Fast Initiate command to the end of the M24LR64E-R response.

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

26.20

Fast Read Multiple Block

On receiving the Fast Read Multiple Block command, the M24LR64E-R reads the selected

blocks and sends back their value in multiples of 32 bits in the response. The blocks are

numbered from 00h to 1FFh in the request and the value is minus one (–1) in the field. For

example, if the “Number of blocks” field contains the value 06h, seven blocks are read. The

maximum number of blocks is fixed to 32 assuming that they are all located in the same

sector. If the number of blocks overlaps sectors, the M24LR64E-R returns an error code.

The Protocol_extension_flag should be set to 1 for the M24LR64E-R to operate correctly. If

the Protocol_extension_flag is at 0, the M24LR64E-R answers with an error code.

The Option_flag is supported. The data rate of the response is multiplied by 2.

The subcarrier_flag should be set to 0, otherwise the M24LR64E-R answers with an error

code.

Request parameters:

●

Request flag

●

UID (Optional)

●

First block number

●

Number of blocks

Figure 71.

Fast Initiate frame exchange between VCD and M24LR64E-R

VCD

SOF

Fast Initiate

request

EOF

M24LR64E-R

<-t1-> SOF

Fast Initiate

response

EOF

Table 95.

Fast Read Multiple Block request format

Request

SOF

Request_

flags

Fast

Read

Multiple

Block

IC Mfg

code

UID(1)

Gray color means that the field is optional.

First

block

number

Number

blocks

CRC16

Request

EOF

8 bits

C3h

02h

64 bits

16 bits

8 bits

16 bits

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