srt512 STMicroelectronics, srt512 Datasheet - Page 31

• Manufacturer Part Number: srt512
• Description: 13.56 Mhz Short-range Contactless Memory Chip With 512-bit Eeprom And Anticollision Functions
• Manufacturer: STMicroelectronics

SRT512
8.4
SELECT(Chip_ID) command
Command Code = 0Eh
The SELECT() command allows the SRT512 to enter the SELECTED state. Until this
command is issued, the SRT512 will not accept any other command, except for INITIATE(),
PCALL16() and SLOT_MARKER(). The SELECT() command returns the 8 bits of the
Chip_ID value. An SRT512 in SELECTED state, that receives a SELECT() command with a
Chip_ID that does not match its own is automatically switched to DESELECTED state.
Figure 30. SELECT request format
Request parameter:
Figure 31. SELECT response format
Response parameters:
Figure 32. SELECT frame exchange between Reader and SRT512
Reader
SRT512
8-bit Chip_ID stored during the anticollision sequence
Chip_ID of the selected tag. Must be equal to the transmitted Chip_ID
SOF
SOF
SOF
0Eh
SELECT
0Eh
Chip_ID
Chip_ID
8 bits
CRC L
Chip_ID
8 bits
CRC H EOF
8 bits
CRC L
<-t 0 -> <-t 1 ->
8 bits
CRC L
SOF Chip_ID
CRC H
8 bits
CRC H
8 bits
SRT512 commands
CRC L CRC H EOF
EOF
EOF
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