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MC14560B Folha de dados(PDF) 6 Page - Motorola, Inc |
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MC14560B Folha de dados(HTML) 6 Page - Motorola, Inc |
6 / 13 page MOTOROLA CMOS LOGIC DATA MC14560B 6 Table 1. Sum = A + B + C Binary Sums Decimal Numbers Corrected Binary Sums 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 Non valid 1101 BCD 1110 representation 1111 0000 + Carry 0001 + Carry 0010 + Carry 0011 + Carry 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 0000 + Carry 0001 + Carry 0010 + Carry 0011 + Carry 0100 + Carry 0101 + Carry 0110 + Carry 0111 + Carry 1000 + Carry 1001 + Carry ADDITION AND SUBTRACTION OF SIGNED NBCD NUMBERS Using MC14560 NBCD Adders and MC14561 9’s Comple- menters, a sign and magnitude adder/subtracter can be con- figured (Figure 5). Inputs A and B are signed positive (AS, BS = “0”) or negative (AS, BS = “1”). B is added to or subtracted from A under control of an Add/Sub line (subtraction = “1”). The result, R, of the operation is positive signed, positive signed with overflow, negative signed, or negative signed with overflow. Add/subtract time is typically 0.6 + 0.4n µs for n decades. An exclusive–OR of Add/Sub line and BS produces B′, which controls the B complementers. If BS, the sign of B, is a logical “1” (B is negative) and the Add/Sub line is a “0” (add B to A), then the output of the exclusive–OR (BS′) is a logical “1” and B is complemented. If BS = “1” and Add/Sub = “1”, B is not complemented since subtracting a negative number is the same as adding a positive number. When Add/Sub is a “1” and BS = “0”, BS′ is a “1” and B is complemented. The A complementer is controlled by the A sign bit, AS. When AS = “1”, A is complemented. Figure 4. Unsigned NBCD Addition Algorithm 6,941 5,870 + 4 BIT BINARY FULL ADDER DIGIT BINARY SUMS BINARY SUMS WITH CARRY FROM CONVERTERS CODE CONVERTERS CORRECTED SUM 12,811 A B Cin Cout BINARY TO NBCD CODE CONVERTER RESULT, R A1 B1 A2 B2 An Bn Cin Cin Cin Cout Cout Cout R1 R2 Rn OVERFLOW THOUSANDS 0110 0101 HUNDREDS 1001 1000 TENS 0100 0111 UNITS 0001 0000 ADDER Cin ADDER Cin ADDER Cin ADDER 1 1 0 1011 0001 1011 0001 1 1100 0010 1011 0001 1 Cout Cout Cout Cout 1 0 0 1 0 1 0 0 0 0 0 0 1 0 0 0 1 Figure 5. Addition of Unsigned NBCD Numbers (a) MC14560 Block Diagram (b) n–Decade Adder Typical Add Time = 0.1 + 0.2n µs where n = Number of Decades 4 BIT BINARY ADDERS MC14560 MC14560 MC14560 |
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