SR176_07 Datasheet, PDF (13/35 Pages) STMicroelectronics – 13.56 MHz, 176-bit short range contactless user EEPROM with 64-bit Unique ID

SR176
4.2
Memory mapping
Device selection
After introducing the device in the reader’s electromagnetic field, the SR176 has to be
activated by a INITIATE command. After this command, the SR176 is in the ACTIVE state
and waits for a SELECT command, as shown in Figure 13. The SELECT command
specifies a 4-bit Chip_ID as a parameter. If the Chip-ID of the SR176 matches this
parameter, the SR176 goes in the SELECTED state, and memory blocks become available
for READ_BLOCK and WRITE_BLOCK commands up to the reception of a COMPLETION
command. If the Chip_ID does not match, the SR176 returns to, or stays in, the
DESELECTED state. Write access rights are activated by the SELECT command.
After the Power On of the SR176, if the INITIATE command is not send or is not correctly
generated, memory blocks will not be activated, and the SR176 will not respond to any
command.
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