movs r3，r2，LSR#3 LSR#3是什么意思啊
arm\u6307\u4ee4\u540e\u9762\u6709s\u600e\u4e48\u5f71\u54cd\u6807\u5fd7\u7801\u7684\u554a?\u6bd4\u5982\u8bf4 movs R3 ,R2 ,LSR , #2 \u5e0c\u671b\u8bf4\u8be6\u7ec6\u70b9\u6bd4\u5982\u8bf4\u8fd9\u6837\u4e00\u4e2a\u7a0b\u5e8f\u6bb5\uff1a
Bcopy MOVS R3,R2,LSR #4 ;\u9700\u8981\u8fdb\u884c\u7684\u4ee54\u4e2a\u5b57\u4e3a\u5355\u4f4d\u7684\u590d\u5236\u6b21\u6570
BEQ Cword ;\u82e5\u4e0d\u8db34\u4e2a\u5b57\uff0c\u5219\u53f3\u79fb\u540eR2=0\uff0cZ=1
;\u5219\u8df3\u8f6c\u5230Cword\u4ee5\u5b57\u4e3a\u5355\u4f4d\u590d\u5236
\u5728\u8fd9\u91cc\uff0c\u6bcf\u4e00\u6b21\u590d\u5236\u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u8fdb\u884c\u4e00\u6b21\u5224\u65ad\uff0c\u5982\u679c\u5269\u4f59\u7684\u957f\u5ea6\u5c0f\u4e8e4\uff0c\u53f3\u79fb\u540eR2=0\uff0cZ\u6807\u8bc6\u7b26=1\uff0c\u5219\u4f1a\u8fdb\u884c\u8df3\u8f6c\u3002\u5b8c\u6210\u4e86\u901a\u8fc7\u4e00\u4e2amov\u8bed\u53e5\uff0c\u540c\u65f6\u5bf9\u6807\u8bc6\u7b26\u7684\u4fee\u6539\u6765\u8fdb\u884c\u5224\u65ad\u3001\u8df3\u8f6c\u7684\u529f\u80fd\u3002
\u4e00\uff0c\u5f00\u5173S1\uff0cS2\u90fd\u95ed\u5408\u65f6\uff0cR1\u88ab\u77ed\u8def\uff0c\u53ea\u6709R2\u4e0eR3\u5e76\u8054\u5de5\u4f5c\uff0c\u7535\u6d41\u8868\u6d4b\u91cf\u5e72\u8def\u7535\u6d41\u3002
\u75311/R'=1/R2+1/R3\u5f97\u5230R'=R2R3/(R2+R3)\u6c42R2\u4e0eR3\u5e76\u8054\u7684\u603b\u7535\u963b\uff1a
R'=R2R3/(R2+R3)=3\u03a9\u00d76\u03a9/(3\u03a9+6\u03a9)=2\u03a9\uff1b
\u7531I=U/R\u5f97\u5230U=IR\u6c42\u7535\u6e90\u63d0\u4f9b\u7684\u7535\u538b\uff1a
U=I'R'=2A\u00d72\u03a9=4V\uff0c
\u4e8c\uff0c\u5f00\u5173S1\uff0cS2\u90fd\u65ad\u5f00\u65f6\uff0cR3\u5f00\u8def\uff0c\u53ea\u6709R1\u4e0eR2\u4e32\u8054\u5de5\u4f5c\uff0c\u7535\u6d41\u8868\u6d4b\u91cf\u4e32\u8054\u7535\u8def\u4e2d\u7684\u7535\u6d41\u3002
\u7531I=U/R\u5f97\u5230R=U/I\u6c42R1\u4e0eR2\u4e32\u8054\u7684\u603b\u7535\u963b\uff1a
R''=U/I''=4V/0.5A=8\u03a9\uff0c
\u7531R1=R''-R2\u6c42\u5b9a\u503c\u7535\u963bR1\u7684\u963b\u503c\uff1a
R1=R''-R2=8\u03a9-3\u03a9=5\u03a9\u3002
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