mcs-51單片機(jī)實(shí)用子程序庫(kù)(留存版)
【正文】 JC SQR0 ；原被開(kāi)方數(shù)的階碼是奇數(shù)嗎？MOV A,R0 ；是奇數(shù)，尾數(shù)右規(guī)一次RRC AMOV R0,AINC R0MOV A,R0RRC AMOV R0,ADEC R0SQR0: MOV A,R0JZ SQR9 ；尾數(shù)為零，不必運(yùn)算MOV R2,A ；將尾數(shù)傳送到R2R3中INC R0MOV A,R0MOV R3,AMOV A,R2 ；快速開(kāi)方，參閱定點(diǎn)子程序說(shuō)明ADD A,57HJC SQR2ADD A,45HJC SQR1ADD A,24HMOV B,0E3HMOV R4,80HSJMP SQR3SQR1: MOV B,0B2HMOV R4,0A0HSJMP SQR3SQR2: MOV B,8DHMOV R4,0D0HSQR3: MUL ABMOV A,BADD A,R4MOV R4,AMOV B,AMUL ABXCH A,R3CLR CSUBB A,R3MOV R3,AMOV A,BXCH A,R2SUBB A,R2MOV R2,ASQR4: SETB CMOV A,R4RLC AMOV R6,ACLR ARLC AMOV R5,AMOV A,R3SUBB A,R6MOV B,AMOV A,R2SUBB A,R5JC SQR5INC R4MOV R2,AMOV R3,BSJMP SQR4SQR5: MOV A,R4XCH A,R2RRC AMOV F0,CMOV A,R3MOV R5,AMOV R4,8SQR6: CLR CMOV A,R3RLC AMOV R3,ACLR CMOV A,R5SUBB A,R2JB F0,SQR7JC SQR8SQR7: MOV R5,AINC R3SQR8: CLR CMOV A,R5RLC AMOV R5,AMOV F0,CDJNZ R4,SQR6MOV A,R3 ；將平方根的尾數(shù)回傳到[R0]中MOV R0,ADEC R0MOV A,R2MOV R0,ASQR9: DEC R0 ；數(shù)據(jù)指針回歸原位CLR OV ；開(kāi)方結(jié)果有效RET（１８） 標(biāo)號(hào)： ＦＰＬＮ 功能：浮點(diǎn)數(shù)多項(xiàng)式計(jì)算入口條件：自變量在[R0]中，多項(xiàng)式系數(shù)在調(diào)用指令之后，以４０Ｈ結(jié)束。出口信息：OV
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