EM4056
DeselTag
The DeselTag command address a transponder with its 32 bit address (ROM) and reset the flag Select to 0.
1 bit
Reader
Start
4 bits
MSB
DeselTag
32 bits
MSB
ROM
8 bits
X8
CRC
2 bits
X8
Transponder
tsp
Sel nSel
CRC
Fig. 9
8 bits
Prot
Prot command for writing the 2 (OTP) protection bit (read and write) at the specified address.
1 bit
Reader
Start
4 bits
MSB
Prot
8 bits
MSB
Address
2 bits
MSB
Wp/Rp
8 bits
X8
CRC
2 bits
Transponder
twp
WOk nWOk
8 bits
X8
CRC
Fig. 10
Wp=1, the specified address is protected against writing.
Rp=1, the specified address is protected against reading.
WOk=1, the protection bit has been successfully written to one.
Read
Read command to get a 16-bit word located at the specified address. If the address is read protected, the circuit transmits a
65535 value.
1 bit
Reader
Start
4 bits
MSB
Read
8 bits
MSB
Address
8 bits
X8
CRC
16 bits
3 bits
8 bits
MSB
X8
trp
Datas
Prot
CRC
Prot = (Wp / Rp / Suc)
Fig. 11
Transponder
Datas
12345 dec
65535 dec
65535 dec
65535 dec
Rp
0
0
1
0
Suc
0
0
x
1
Definition
Data = 12345
Data = 65535
Read protected
Read protected by PIN
Wp=1, the specified address is protected against writing.
Rp=1, the specified address is protected against reading.
Suc=1, the specified address is protected by the PIN against reading.
Copyright
©
2005, EM Microelectronic-Marin SA
7
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EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
