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<TD width=745 height=1>MCS-51單片機實用子程序庫
<P>（２５） 標號： ＦＴＯＤ 功能：格式化浮點數轉換成雙字節定點數</P>
<P>入口條件：格式化浮點操作數在[R0]中。<BR>出口信息：OV=1時溢出，OV=0時轉換成功：定點數的絕對值在[R0]中（雙字節），數符<BR>在位1FH中，F0=1
時為整數，CY=1時為一字節整數一字節小數，否則為純小數。<BR>影響資源：PSW、A、B、R2、R3、R4、位1FH 堆棧需求：
６字節<BR>FTOD: LCALL MVR0 ；將[R0]傳送到第一工作區<BR>MOV A,R2<BR>JZ FTD4
；階碼為零，純小數<BR>JB ACC.7,FTD4；階碼為負，純小數<BR>SETB C<BR>SUBB A,#10H<BR>JC
FTD1<BR>SETB OV ；階碼大于１６，溢出<BR>RET<BR>FTD1: SETB C<BR>MOV
A,R2<BR>SUBB A,#8 ；階碼大于８否？<BR>JC FTD3<BR>FTD2: MOV B,#10H
；階碼大于８，按雙字節整數轉換<BR>LCALL FTD8<BR>SETB F0 ；設立雙字節整數標志<BR>CLR C<BR>CLR
OV<BR>RET<BR>FTD3: MOV B,#8 ；按一字節整數一字節小數轉換<BR>LCALL FTD8<BR>SETB C
；設立一字節整數一字節小數標志<BR>CLR F0<BR>CLR OV<BR>RET<BR>FTD4: MOV B,#0
；按純小數轉換<BR>LCALL FTD8<BR>CLR OV ；設立純小數標志<BR>CLR F0<BR>CLR
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