51 single-chip 8-bit belt symbol multiplication operation (assembly)

Using a single approach to the symbol bit processing, the following processing steps: separate treatment of the sign bit of the multiplicand and the multiplier, the multiplicand approach is taken alone and the symbol bit XOR operation, and the multiplier symbol bits since the sign bit of the product The rules are the same as the same number, and the heterogeneous is multiplied. The absolute value of the multiplier and multiplier, and multiply the absolute value of the two absolute values, the method is to determine the symbol bit of the multiplier and multiplier: If it is positive, it is an absolute value. If it is negative, it is necessary to supplement it. The product is processed. If it is positive, the product is not processed; if the negative, the intensity is supplemented to make it into the form of complement. R0 and R1 are the number of band symbols in two complement forms, R3R2 is accumulated R0 * R1 = R3R2 ORG 0600H'sbit Bit 20h.0 Sbit1 Bit 20h.1sbit2 Bit 20H.2 MOV A, R0 is sent to Arlc A Multiplier symbols to send Cymov sbit1, c feed to SBIT1MOV A, R1 multiply to send Arlc A multiplier symbols to send cymiV sbit2, c sent to SBIT2ANL C, / sbit1 sbit1 non-SBIT2 to send CYMOV SBIT, C to SBitmov C, sbit1 sbit1 Send Cyanl C, SBIT2 SBIT1 and SBIT2 Non-send Cyorl C, SBitum Symbols Send CYMOV SBIT, C Give SBitmov A, R0 Processing Multiply JNB Sbit1, Nch1 If she is positive, turn nch1cpl A if she is negative If the absolute value of the supplement INC A NCH1: MOV B, A is multiplied by the absolute value to send B MOV A, R1: Treatment Multiplier JNB SBIT2, NCH2 If it is positive, turn Nch2cpl A If she is negative, then ask The absolute value of add A, # 01H NCH2: MUL AB SPIT, NCH3 is positive, then the Nch3CPL A is negative, then the low byte begins to supplement Add A, # 01h nch3: MOV R2, the low byte of the accumulation of R2MOV A, B-accumulated high byte to send AJNB SBIT, NCH4 is positive, then the NCH4CPL A is negative, then high byte begins to supplement AddC a, 00h NCH4: MOV R3, high byte of the accumulation of R3Sjmp $ END, read the full story

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