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AT89C51AC3-RDTIM Datasheet(PDF) 49 Page - ATMEL Corporation |
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AT89C51AC3-RDTIM Datasheet(HTML) 49 Page - ATMEL Corporation |
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49 / 143 page  49 AT89C51AC3 4383B–8051–01/05 Figure 26. Flash and Extra Row Programming Procedure Hardware Security Byte The following procedure is used to program the Hardware Security Byte space and is summarized in Figure 27: • Set FPS and map Hardware byte (FCON = 0x0C) • Save and disable the interrupts. • Load DPTR at address 0000h. • Load Accumulator register with the data to load. • Execute the MOVX @DPTR, A instruction. • Launch the programming by writing the data sequence 54h followed by A4h in FCON register (only from FM1). The end of the programming indicated by the FBusy flag cleared. • Restore the interrupts. Flash Spaces Programming Save and Disable IT EA = 0 Launch Programming FCON = 5xh FCON = Axh End Programming Restore IT Column Latches Loading see Figure 25 FBusy Cleared? Clear Mode FCON = 00h |
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