Device operations (instructions)

SR176

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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

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):

●

●

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

8 bits

ADDRESS

SOF

DATAL

CRCL

CRCH

EOF

AI07706B

8 bits

8 bits

8 bits

DATAH

8 bits