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T555711M01-DDT Datasheet(PDF) 9 Page - ATMEL Corporation |
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T555711M01-DDT Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 30 page  9 T5557 4517E–RFID–02/03 Figure 10. Complete Writing Sequence Figure 11. T5557 Command Formats Password When password mode is active (PWD = 1), the first 32 bits after the opcode are regarded as the password. They are compared bit by bit with the contents of block 7, starting at bit 1. If the comparison fails, the T5557 will not program the memory, instead it will restart in regular-read mode once the command transmission is finished. Note: In password mode, MAXBLK should be set to a value below 7 to prevent the password from being transmitted by the T5557. Each transmission of the direct access command (two opcode bits, 32 bits password, ‘0’ bit plus 3 address bits = 38 bits) needs about 18 ms. Testing all possible combinations (about 4.3 billion) takes about two years. Answer-On-Request (AOR) Mode When the AOR bit is set, the T5557 does not start modulation in the regular-read mode after loading configuration block 0. The tag waits for a valid AOR data stream (“wake-up command”) from the reader before modulation is enabled. The wake-up command con- sists of the opcode (‘10‘) followed by a valid password. The selected tag will remain active until the RF field is turned off or a new command with a different password is transmitted which may address another tag in the RF field. POR Block 0 loading Read mode Block address Programming Block data Lock bit Opcode Read mode Start gap Write mode T55571x T555701 AOR (wake-up command) Protected write Standard write Direct access (PWD = 1) Reset command Opcode L 1 Data 32 2 Addr 0 1 Password 32 L 1 Data 32 2 Addr 0 10 1 Password 32 1 Password 32 2 Addr 0 Direct access (PWD = 0) 2 Addr 0 00 Page 0/1 regular read 0 0 * p = page selector 1p * 1p * 1p * 1p * 1p * |
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