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LRIS2K 数据表(PDF) 81 Page - STMicroelectronics |
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LRIS2K 数据表(HTML) 81 Page - STMicroelectronics |
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81 / 102 page  LRIS2K Present Password 81/102 39 Present Password On receiving the Present Password command, the LRIS2K compares the requested password with the data contained in the request and reports whether the operation has been successful in the request. The Option_flag is supported. During the comparison cycle equal to tW, there should be no modulation (neither 100% nor 10%) otherwise, the LRIS2K the Password value may not be correctly compared. The tW time is equal to t1nom + 18 × 302 µs. After a successful command, the access to all the memory blocks linked to the password is changed as described in Section 2: LRIS2K block security. Request parameters: ● UID (optional) ● Password number (0x01 = Pswd1, 0x02 = Pswd2, 0x03 = Pswd3, other = Error) ● Data Response parameter: ● No parameter. The response is send back after the writing cycle Response parameter: ● Error code as Error_flag is set: – 0Fh: other error Table 76. Present Password request format Request SOF Request _flags Present Password IC Mfg code UID Password number Data CRC16 Request EOF 8 bits B3h 02h 64 bits 8 bits 32 bits 16 bits Table 77. Present Password response format when Error_flag is NOT set Response SOF Response_flags CRC16 Response EOF 8 bits 16 bits Table 78. Present Password response format when Error_flag is set Response SOF Response_ Flags Error code CRC16 Response EOF 8 bits 8 bits 16 bits |
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