SR176_07 Datasheet, PDF (18/35 Pages) STMicroelectronics – 13.56 MHz, 176-bit short range contactless user EEPROM with 64-bit Unique ID

Device operations (instructions)
SR176
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):
● DATA_L: least significant Byte
● DATA_H: 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
SOF
READ_BLOCK
ADDRESS
08h
4 zero-bits
+ 4-bit address
CRCL
8 bits
Figure 25. READ_BLOCK response format
CRCH
8 bits
EOF
AI07705B
SOF
DATAL
8 bits
DATAH
8 bits
CRCL
8 bits
CRCH
8 bits
EOF
AI07706B
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