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M24LR64E-R 数据表(PDF) 104 Page - STMicroelectronics |
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M24LR64E-R 数据表(HTML) 104 Page - STMicroelectronics |
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104 / 140 page  Command codes M24LR64E-R 104/140 Doc ID 022712 Rev 3 When configured in the RF busy mode, the RF WIP/BUSY pin is tied to 0 from the SOF that starts the Lock-sector command to the end of the M24LR64E-R response. When configured in the RF write in progress mode, the RF WIP/BUSY pin is tied to 0 for the duration of the internal write cycle (from the end of a valid Lock sector command to the beginning of the M24LR64E-R response). 26.16 Present-sector Password On receiving the Present-sector Password command, the M24LR64E-R compares the requested password with the data contained in the request and reports whether the operation has been successful in the response. The Option_flag is supported. During the comparison cycle equal to Wt, there should be no modulation (neither 100% nor 10%), otherwise the M24LR64E-R Password value may not be correctly compared. The Wt 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 4.1: M24LR64E-R block security in RF mode. Request parameter: ● Request flags ● UID (optional) ● Password Number (0x01 = Pswd1, 0x02 = Pswd2, 0x03 = Pswd3, other = Error) ● Password Response parameter: ● No parameter. The response is sent back after the write cycle. Table 84. Present-sector Password request format Request SOF Request _flags Present- sector Password IC Mfg code UID(1) 1. Gray color means that the field is optional. Password number Password CRC16 Request EOF 8 bits B3h 02h 64 bits 8 bits 32 bits 16 bits Table 85. Present-sector Password response format when Error_flag is NOT set Response SOF Response_flags CRC16 Response EOF 8 bits 16 bits Table 86. Present-sector 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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