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M24LR64-R_1006 数据表(PDF) 97 Page - STMicroelectronics |
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M24LR64-R_1006 数据表(HTML) 97 Page - STMicroelectronics |
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97 / 128 page  M24LR64-R Commands codes Doc ID 15170 Rev 10 97/128 26.14 Write-sector Password On receiving the Write-sector Password command, the M24LR64-R uses the data contained in the request to write the password and reports whether the operation was successful in the response. The Option_flag is supported. During the RF write cycle time, Wt, there must be no modulation at all (neither 100% nor 10%). Otherwise, the M24LR64-R may not correctly program the data into the memory. The Wt time is equal to t1nom + 18 × 302 µs. After a successful write, the new value of the selected password is automatically activated. It is not required to present the new password value until M24LR64-R power-down. Request parameter: ● UID (optional) ● Password number (01h = Pswd1, 02h = Pswd2, 03h = Pswd3, other = Error) ● Data Response parameter: ● 32-bit password value. The response is sent back after the write cycle. Response parameter: ● Error code as Error_flag is set: – 02h: the command is not recognized, for example: a format error occurred – 03h: the option is not supported – 0Fh: error with no information given – 10h: the specified block is not available – 12h: the specified block is locked and its contents cannot be changed. – 13h: the specified block was not successfully programmed Table 73. Write-sector Password request format Request SOF Request _flags Write- sector Password IC Mfg code UID(1) 1. Gray means that the field is optional. Password number Data CRC16 Request EOF 8 bits B1h 02h 64 bits 8 bits 32 bits 16 bits Table 74. Write-sector Password response format when Error_flag is NOT set Response SOF Response_flags CRC16 Response EOF 8 bits 16 bits Table 75. Write-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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