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What do SUBS Rn, Rn, # 1 in this ARM assembler mean, and what does BCC mean?
Rn，Rn，# 1

Rn itself subtracts 1 and sets the flag bit.

LPM bcc company

This means that if the c flag is 0 (no borrowing), jump to the label LPM (the c flag is set by the SUBS of the previous sentence).

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