ATA5575M1 ATMEL Corporation, ATA5575M1 Datasheet - Page 4

• Manufacturer Part Number: ATA5575M1
• Manufacturer: ATMEL Corporation

4.8
4.9
4.10
4
Mode Register
Modulator
Memory
ATA5575M1 [Preliminary]
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.
The modulator encodes the serialized EEPROM data for transmission to a tag reader or a
base station. Modulation available: Manchester.
Figure 4-1.
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.
1………………....…………….8
Configuration Data
Not transmitted
User Data
User Data
User Data
User Data
User Data
User Data
User Data
User Data
User Data
User Data
User Data
User Data
User Data
User Data
User Data
User Data
Memory Map
8 bits
Byte 16
Byte 15
Byte 14
Byte 13
Byte 12
Byte 11
Byte 10
Byte 9
Byte 8
Byte 7
Byte 6
Byte 5
Byte 4
Byte 3
Byte 2
Byte 1
Byte 0
9167AS–RFID–11/09