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ST25DV64K 数据表(PDF) 90 Page - STMicroelectronics |
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ST25DV64K 数据表(HTML) 90 Page - STMicroelectronics |
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90 / 200 page ![]() Figure 38. Extended Write Single frame exchange between VCD and ST25DVxxx SOF Extended Write Single request VCD EOF ST25DVxxx t1 SOF Extended Write Single response EOF SOF Extended Write Single response EOF ST25DVxxx Wt Write sequence when error 7.6.10 Lock Block On receiving the Lock block request, the ST25DVxxx locks the single block value permanently and protects its content against new writing. This command is only applicable for the blocks 0 and 1 which may include a CC file. For a global protection of a area, update accordingly the RFAiSS bits in the system area. The Option_flag is supported, when set wait for EOF to respond. The Inventory_flag must be set to 0. During the RF write cycle Wt, there should be no modulation (neither 100% nor 10%), otherwise the ST25DVxxx may not lock correctly the single block value in memory. The Wt time is equal to t1nom + N × 302 µs (N is an integer). Table 119. Lock block request format Request SOF Request_flags Lock block UID (1) block number CR7C16 Request EOF - 8 bits 22h 64 bits 8 bits 16 bits - 1. This field is optional. Request parameter: • Request Flags • UID (optional) • Only block numbers 0 and 1 are allowed to protect the CCFile in case of NDEF (from LSB byte to MSB byte) Table 120. Lock block response format when Error_flag is NOT set Response SOF Response_flags CRC16 Response EOF - 8 bits 16 bits - Response parameter: • No parameter Table 121. Lock block response format when Error_flag is set Response SOF Response_flags Error code CRC16 Response EOF - 8 bits 8 bits 16 bits - ST25DV04K ST25DV16K ST25DV64K RF commands DS10925 - Rev 9 page 90/200 |
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