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T89C51AC2-RLSI-M 数据表(PDF) 27 Page - ATMEL Corporation |
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T89C51AC2-RLSI-M 数据表(HTML) 27 Page - ATMEL Corporation |
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27 / 117 page  Draft.A - March 30, 2001 27 Preview - Confidential T89C51AC2 Hardware Security The following procedure is used to program the Hardware Security space and is summarized in Figure 14: • Set FPS and map Harware 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 14. 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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