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size=3><B>MCS-51單片機實用子程序庫（三）</B></FONT></P></TD></TR></TBODY></TABLE>
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<TD width=745 height=1>MCS-51單片機實用子程序庫
<P>（２３）標號： ＢＨＤ２ 功能：雙字節(jié)ＢＣＤ碼小數(shù)轉(zhuǎn)換成雙字節(jié)十六進制小數(shù)</P>
<P>入口條件：待轉(zhuǎn)換的雙字節(jié)ＢＣＤ碼小數(shù)在R4、R5中。<BR>出口信息：轉(zhuǎn)換后的雙字節(jié)十六進制小數(shù)在R2、R3中。*<BR>影響資源：PSW、A、R2～R6
堆棧需求： ２字節(jié)<BR>BHD2: MOV R6,#10H ；準備計算兩個字節(jié)小數(shù)<BR>BHD3: MOV A,R5
；按十進制倍增<BR>ADD A,R5<BR>DA A<BR>MOV R5,A<BR>MOV A,R4<BR>ADDC
A,R4<BR>DA A<BR>MOV R4,A<BR>MOV A,R3 ；將進位標志移入結(jié)果中<BR>RLC A<BR>MOV
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