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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT89C51ED2-RDTUM датащи(PDF) 97 Page - ATMEL Corporation |
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AT89C51ED2-RDTUM датащи(HTML) 97 Page - ATMEL Corporation |
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97 / 137 page  97 4235K–8051–05/08 AT89C51RD2/ED2 Table 24-5. User Memory Lock Bits of the SSB Note: X: Do not care WARNING: Security level 2 and 3 should only be programmed after Flash verification. 24.4 Flash Memory Status AT89C51RD2/ED2 parts are delivered in standard with the ISP ROM bootloader. After ISP or parallel programming, the possible contents of the Flash memory are summarized in Figure 24-1: Figure 24-1. Flash Memory Possible Contents 24.5 Memory Organization When the EA pin is high, the processor fetches instructions from internal program Flash. If the EA pin is tied low, all program memory fetches are from external memory. 24.6 Bootloader Architecture 24.6.1 Introduction The bootloader manages communication according to a specifically defined protocol to provide the whole access and service on Flash memory. Furthermore, all accesses and routines can be called from the user application. Program Lock Bits Protection Description Security Level LB0 LB1 1 1 1 No program lock features enabled. 2 0 1 ISP programming of the Flash is disabled. 3 X 0 Same as 2, also verify through ISP programming interface is disabled. 0000h Virgin Default After ISP After Parallel Programming After Parallel Programming After Parallel Programming Application Application Virgin After ISP or Dedicated ISP Dedicated ISP Application Virgin or Application Virgin or Application FFFFh |
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