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34LC02-I/P датащи(PDF) 12 Page - Microchip Technology |
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34LC02-I/P датащи(HTML) 12 Page - Microchip Technology |
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12 / 40 page ![]() 34AA02/34LC02 DS20002029G-page 12 2007-2022 Microchip Technology Inc. and its subsidiaries TABLE 7-1: SOFTWARE WRITE PROTECTION INSTRUCTION SET WP = 0 Instruction Address Pins Device Type Identifier Chip Select Bits R/W A2 A1 A0(1) B7 B6 B5 B4 B3(2) B2(2) B1(2) B0 SWP VSS VSS VHV 01100010 CSWP VSS VCC VHV 01100110 PSWP A2 A1 A0 0110 A2 A1 A0 0 Read SWP VSS VSS VHV 01100011 Read CSWP VSS VCC VHV 01100111 Read PSWP A2 A1 A0 0110 A2 A1 A0 1 Note 1: A0 is used to detect VHV for the SWP and CSWP commands. 2: B3, B2 and B1 are compared to the A2, A1 and A0 external pins, respectively. TABLE 7-2: ACKNOWLEDGE TABLE FOR WRITE OR WRITE PROTECTION WITH R/W = 0 Status Write- Protect Instruction ACK Address ACK Data Byte ACK Write Cycle Permanently Protected x PSWP, SWP, CSWP No ACK Don’t Care No ACK Don’t Care No ACK No Page or Byte Write in lower 128 bytes ACK Address ACK Data No ACK No Protected with SWP 0 SWP No ACK Don’t Care No ACK Don’t Care No ACK No CSWP ACK Don’t Care ACK Don’t Care ACK Yes PSWP ACK Don’t Care ACK Don’t Care ACK Yes Page or Byte Write in lower 128 bytes ACK Address ACK Data No ACK No 1 SWP No ACK Don’t Care No ACK Don’t Care No ACK No CSWP ACK Don’t Care ACK Don’t Care No ACK No PSWP ACK Don’t Care ACK Don’t Care No ACK No Page or Byte Write ACK Address ACK Data No ACK No Not Protected 0 PSWP, SWP or CSWP ACK Don’t Care ACK Don’t Care ACK Yes Page or Byte Write ACK Address ACK Data ACK Yes 1 PSWP, SWP or CSWP ACK Don’t Care ACK Don’t Care No ACK No Page or Byte Write ACK Address ACK Address No ACK No TABLE 7-3: ACKNOWLEDGE TABLE FOR WRITE OR WRITE PROTECTION WITH R/W = 1 Status Instruction ACK Permanently Protected PSWP, SWP, CSWP No ACK Protected with SWP SWP No ACK CSWP ACK PSWP ACK Not protected PSWP, SWP, CSWP ACK |
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