Owner's manual

4
9167AS–RFID–11/09
ATA5575M1 [Preliminary]
4.8 Mode Register
The mode register maintains a readable shadow copy of the configuration data held in byte 16
of the EEPROM. It is continually refreshed during read mode and (re-)loaded after every POR
event or reset command. Depending on the version, the configuration data is pre-programmed
when leaving Atmel’s production.
4.9 Modulator
The modulator encodes the serialized EEPROM data for transmission to a tag reader or a
base station. Modulation available: Manchester.
4.10 Memory
The memory is a 136-bit EEPROM, which is arranged in 17 bytes of 8 bits each. Programming
is carried out byte-wise, so a complete byte will be programmed with a single command.
Byte 16 contains the mode/configuration data, which is not transmitted during regular read
operations.
A special bit combination in byte 16 will lock the entire memory. Once locked, the memory
(including byte 16 itself) can not be re-programmed once more via the RF field.
Figure 4-1. Memory Map
1………………....…………….8
Configuration Data Byte 16
User Data Byte 15
User Data Byte 14
User Data Byte 13
User Data Byte 12
User Data Byte 11
User Data Byte 10
User Data Byte 9
User Data Byte 8
User Data Byte 7
User Data Byte 6
User Data Byte 5
User Data Byte 4
User Data Byte 3
User Data Byte 2
User Data Byte 1
User Data Byte 0
8 bits
Not transmitted