SR176_07 datasheet(18/35 Pages) STMICROELECTRONICS

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Device operations (instructions)

SR176

18/35

5.4

READ_BLOCK

Command Code = 08h,(X.AD)

When receiving the READ_BLOCK command, the SR176 reads the requested block and

sends back its 16-bit value in response (Figure 26). The AD value of the four least significant

bits of the address code, (X.AD) (b3 to b0) represents the block address to be read. For

example, address 06h sends back the value of block 6.

Prior to any READ_BLOCK command, the SR176 must have been set into the SELECTED

state.

Request parameters (Figure 24):

●

ADDRESS: to specify an address block from 00h to 0Eh

Response parameters (Figure 25):

●

DATAL: least significant Byte

●

DATAH: most significant Byte

5.5

Read the 64-bit UID

To read the complete 64-bit UID value from the SR176, the reader must provide a sequence

of four READ_BLOCK commands, in the following order (Figure 27):

●

READ_BLOCK @ 0 to get UID0

●

READ_BLOCK @ 1 to get UID1

●

READ_BLOCK @ 2 to get UID2

●

READ_BLOCK @ 3 to get UID3

Figure 24.

READ_BLOCK request format

Figure 25.

READ_BLOCK response format

SOF

READ_BLOCK

CRCL

CRCH

EOF

AI07705B

08h

4 zero-bits

+ 4-bit address

8 bits

ADDRESS

SOF

DATAL

CRCL

CRCH

EOF

AI07706B

8 bits

DATAH

8 bits

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