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EM4056B6CB2RC Datasheet(PDF) 8 Page - EM Microelectronic - MARIN SA |
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EM4056B6CB2RC Datasheet(HTML) 8 Page - EM Microelectronic - MARIN SA |
8 / 14 page EM4056 Copyright © 2005, EM Microelectronic-Marin SA 8 www.emmicroelectronic.com Write Write command for 16 bits of data at the specified address. 1 bit 4 bits MSB 8 bits MSB 16 bits MSB 8 bits X8 Reader Start Write Address Datas CRC 2 bits 8 bits X8 Transponder twp WOk nWOk 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 0 Z_Suc[2:0] 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] Area protected Addresses protected 000 00 % None, incl. PIN 100 25 % Word 127 – Word 96 101 50 % Word 95 – Word 64 110 75 % Word 63 – Word 32 111 100 % 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. |
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