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AN4253 数据表(PDF) 31 Page - STMicroelectronics |
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AN4253 数据表(HTML) 31 Page - STMicroelectronics |
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31 / 44 page  DocID024255 Rev 2 31/44 AN4253 Application ‘asm’ startup 9 Application ‘asm’ startup Before jumping to ‘C’ language to continue with the startup there are still some steps required. These steps are completely under user or any other software vendor (i.e. OS supplier) responsibility. Simply this ‘asm’ part shall prepare a base for the ‘C’ programming environment. Among usual steps belongs: • Initialization of r1 register (link register) • Initialization of r2 register (sdata2 base pointer) • Initialization of r13 register (sdata base pointer) • Stack initialization • Initialization of initialized variables |
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