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M24LR16E-R 数据表(PDF) 104 Page - STMicroelectronics |
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M24LR16E-R 数据表(HTML) 104 Page - STMicroelectronics |
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104 / 143 page  Command codes M24LR16E-R 104/143 Doc ID 018932 Rev 8 When configured in the RF busy mode, the RF WIP/BUSY pin is tied to 0 from the SOF that starts the Write-sector Password command to the end of the M24LR16E-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 Write sector password command to the beginning of the M24LR16E-R response). 26.15 Lock-sector On receiving the Lock-sector command, the M24LR16E-R sets the access rights and permanently locks the selected sector. The Option_flag is supported. A sector is selected by giving the address of one of its blocks in the Lock-sector request (Sector number field). For example, addresses 0 to 31 are used to select sector 0 and addresses 32 to 63 are used to select sector 1. Care must be taken when issuing the Lock- sector command as all the blocks belonging to the same sector are automatically locked by a single command. The Protocol_extension_flag should be set to 1 for the M24LR16E-R to operate correctly. If the Protocol_extension_flag is at 0, the M24LR16E-R answers with an error code. During the RF write cycle Wt, there should be no modulation (neither 100% nor 10%), otherwise, the M24LR16E-R may not correctly lock the memory block. The Wt time is equal to t1nom + 18 × 302 µs. Request parameters: ● Request flags ● (optional) UID ● Sector number ● Sector security status (refer to Table 81) Table 80. Lock-sector request format Request SOF Request _flags Lock- sector IC Mfg code UID(1) 1. Gray means that the field is optional. Sector number Sector security status CRC16 Request EOF 8 bits B2h 02h 64 bits 16 bits 8 bits 16 bits Table 81. Sector security status b7 b6 b5 b4 b3 b2 b1 b0 0 0 0 password control bits Read / Write protection bits 1 Table 82. Lock-sector response format when Error_flag is NOT set Response SOF Response_flags CRC16 Response EOF 8 bits 16 bits |
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