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M24LR64E-R 数据表(PDF) 84 Page - STMicroelectronics |
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M24LR64E-R 数据表(HTML) 84 Page - STMicroelectronics |
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84 / 140 page ![]() Command codes M24LR64E-R 84/140 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 Read Single Block command to the end of the M24LR64E-R response. When configured in the RF write in progress mode, the RF WIP/BUSY pin remains in high-Z state. 26.4 Write Single Block On receiving the Write Single Block command, the M24LR64E-R writes the data contained in the request to the requested block and reports whether the write operation was successful in the response. The Protocol_extension_flag should be set to 1 for the M24LR64E-R to operate correctly. If the Protocol_extension_flag is at 0, the M24LR64E-R answers with an error code. The Option_flag is supported. During the RF write cycle Wt, there should be no modulation (neither 100% nor 10%), otherwise the M24LR64E-R may not program correctly the data into the memory. The Wt time is equal to t1nom + 18 × 302 µs. Request parameters: ● Request flags ● UID (optional) ● Block number ● Data Response parameter: ● No parameter. The response is sent back after the writing cycle. Figure 54. Read Single Block frame exchange between VCD and M24LR64E-R VCD SOF Read Single Block request EOF M24LR64E-R <-t1-> SOF Read Single Block response EOF Table 44. Write Single Block request format Request SOF Request_ flags Write Single Block UID(1) 1. Gray color means that the field is optional. Block number Data CRC16 Request EOF 8 bits 21h 64 bits 16 bits 32 bits 16 bits Table 45. Write Single Block response format when Error_flag is NOT set Response SOF Response_flags CRC16 Response EOF 8 bits 16 bits |
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