e register i (i s 12) is initialized to have a value of i (e.g. re e, r1-1, r2 2 3-3, etc). Assume the main stack (MSP) is used. Also, in the interrupt handler, if LR = 0xFFFFFFF9, then the main stack (MSP) is used. If LR = 0xFFFFFF FD, then the process stack (PSP) is used. The program status register (PSR) 0x00000020, PC
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