EM4056
Write
Write command for 16 bits of data at the specified address.
1 bit
Reader
Start
4 bits
MSB
Write
8 bits
MSB
Address
16 bits
MSB
Datas
8 bits
X8
CRC
2 bits
Transponder
twp WOk nWOk
8 bits
X8
CRC
Fig. 12
WOk=1, the write operation has been successfully executed.
When a word is written at the address (Adr 126), where the configuration is located this command is restricted to write the
uppermost data (Dat_15 à Dat_4), the lower address (Dat_3 to Dat_0) being reserved for safeguarding the PIN counter.
The data at the address of the configuration are:
15
Z_Suc[2:0]
0
M_Suc
No_Ant
Sec
Conf[2:0]
NU NU NU Alm
Pin[2:0]
Fig. 13
where :
•
M_suc : selects a internal mode for which no reading nor writing can extract or engrave valid data into the area of the
memory presently protected by the PIN code.
M_suc=1, area of memory is protected by PIN.
•
Z_suc[2 :0] : determines the address area which is protected by the PIN code. (0% [000], 25%[100], 50%[101], 75
%[110] or 100%[111]).
Z_suc[2:0]
000
100
101
110
111
•
•
•
•
•
Area protected
00 %
25 %
50 %
75 %
100 %
Addresses protected
None, incl. PIN
Word 127 – Word 96
Word 95 – Word 64
Word 63 – Word 32
Word 31 – Word 0
No_Ant : selects the bit "Egal_ROM" and disables the anticollision mode.
No_Ant=1, no anticollision, the tag is always selected (Sel=1).
Sec=1, enables the counter of false attempts for the password (PIN).
Sec=0, counter is disabled.
Conf[2 :0] : represents the maximum number of attempts for finding a valid PIN before definitive lock of the card for
writing.
Pin[2 :0] : represents the number of remaining attempts for finding the correct PIN.
Alm : alarm bit indicates a permanent lock of the card against write attempts. This bit is activated as soon as the number
of PIN erroneous introduction is surpassed.
Copyright
©
2005, EM Microelectronic-Marin SA
8
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EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
