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AT89C5131A-RDTUL 数据表(PDF) 33 Page - ATMEL Corporation |
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AT89C5131A-RDTUL 数据表(HTML) 33 Page - ATMEL Corporation |
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33 / 185 page  33 AT89C5131A-L 4338E–USB–06/06 Hardware Security The following procedure is used to program the Hardware Security space and is sum- marized in Figure 19: • Set FPS and map Hardware byte (FCON = 0x0C) • 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. The end of the programming indicated by the FBusy flag cleared. • Enable the interrupts. Figure 19. Hardware Programming Procedure Flash Spaces Programming Disable IT EA = 0 Launch Programming FCON = 54h FCON = A4h End Programming Enable IT EA = 1 FBusy Cleared? Erase Mode FCON = 00h Data Load DPTR = 00h ACC = Data Exec: MOVX @DPTR, A FCON = 0Ch |
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