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AT80C51SND1C-ROTIL 数据表(PDF) 22 Page - ATMEL Corporation |
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AT80C51SND1C-ROTIL 数据表(HTML) 22 Page - ATMEL Corporation |
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22 / 212 page  6 4109J–8051–10/06 AT8xC51SND1C Figure 6-7. Hardware Boot Process Algorithm The software process (boot loader) is detailed in the “Boot Loader Datasheet” Document. 6.6 Preventing Flash Corruption See Section “Reset Recommendation to Prevent Flash Corruption”, page 48. 6.7 Registers Table 22. AUXR1 Register AUXR1 (S:A2h) – Auxiliary Register 1 Atmel’s Boot Loader Hard Cond? ISP = L? RESET Hard Cond Init ENBOOT = 1 PC = F000h FCON = 00h Prog Cond? BLJB = P? Standard Init ENBOOT = 0 PC = 0000h FCON = F0h Prog Cond Init ENBOOT = 1 PC = F000h FCON = F0h User’s Application 7654 3210 - - ENBOOT - GF3 0 - DPS Bit Number Bit Mnemonic Description 7 - 6 - Reserved The value read from these bits are indeterminate. Do not set these bits. 5 ENBOOT 1 Enable Boot Flash Set this bit to map the boot Flash in the code space between at addresses F000h to FFFFh. Clear this bit to disable boot Flash. 4- Reserved The value read from this bit is indeterminate. Do not set this bit. |
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