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T89C51RD2-3CWC-M 数据表(PDF) 57 Page - ATMEL Corporation |
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T89C51RD2-3CWC-M 数据表(HTML) 57 Page - ATMEL Corporation |
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57 / 86 page ![]() 57 Rev. F - 15 February, 2001 T89C51RD2 Boot process summary The boot process is summarized on the following flowchart: Figure 21. Boot process flowchart CUSTOM BOOT LOADER - BSB: Boot Status Byte - BLJB: Boot Loader Jump Bit (Hardware Bit set to 0 by default) Jump to FC00h DEFAULT BOOT LOADER Jump to 0000h USER APPLICATION Jump to XX00h BLJB = 1 ? Software Boot Vector ? BSB ? Hardware Conditions ? Yes ( PSEN =0, EA =1, and ALE =1 or not connected) Yes BSB= 0 SBV= FCh SBV FCh ≠ XXh = No Hardware Software Reset Falling Edge Jump to FC03h No BSB 00h ≠ |
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