ADD Add Binary ADD Operation: (Source)+(Destination) Destination
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1 ADD Add Binary ADD Operation: (Source)+(Destination) Destination ADD <ea>,dn ADD Dn,<ea> Add the source operand to the destination operand, and store the result in the destination location. The size of the operation may be specified to be byte, word, or long. The mode of the instruction indicates which operand is the source and which is the destination as well as the operand size. ondition odes: * * * * * Set if the result is negative. leared otherwise. Set if the result is zero. leared otherwise. Set if an overflow is generated. leared otherwise. Set if a carry is generated. leared otherwise. Set the same as the carry bit Register Op-Mode Effective Address Mode Register Register field Specifies any of the eight data registers. Op-Mode field Byte Word Long Operation (<Dn>)+(<ea>) <Dn> (<ea>)+(<dn>) <ea> Effective Address field Determines addressing mode: a. If the location specified is a source operand, then all addressing modes are allowed as shown: An* 001 register number Abs.W (An)+ 011 register number d(p) (An) 100 register number d(p,i) d(an) 101 register number Imm * Word and Long only. b. If the location specified is a destination operand, then only alterable memory addressing modes are allowed as shown: Dn d(an,i) 110 register number (An)+ 011 register number d(p) -(An) 100 register number d(p,i) -74-
2 otes: 1. If the destination is a data register, then it cannot be specified by using the destination <ea> mode, but must use the destination Dn mode instead. 2. ADDA is used when the destination is an address register. ADDI and ADDQ are used when the source is immediate data. Most assemblers automatically make this decision. -75-
3 MOE Move Data From Source to Destination MOE Operation: (Source) Destination MOE <ea>,<ea> Move the content of the source to the destination location. The data is examined as it is moved, and the condition codes set accordingly. The size of the operation may be specified to be byte, word or long. ondition odes: * * 0 0 Set if the result is negative. leared otherwise. Set if the result is zero. leared otherwise. Always cleared. Always cleared. ot affected. 0 0 Size Destination Source Register Mode Mode Register Size field Specifies the size of the operand to be moved. 01 byte operation. 11 word operation. 10 long operation. Destination Effective Address field Specifies the destination location. Only data alterable addressing modes are allowed as shown: (An)+ 011 register number d(p) -(An) 100 register number d(p,i) Source Effective Address field Specifies the source operand. All addressing modes are allowed as shown: An* 001 register number Abs.W (An)+ 011 register number d(p) (An) 100 register number d(p,i) d(an) 101 register number Imm * For byte size operation, address register direct is not allowed. otes: 1. MOEA is used when the destination is an address register. Most assemblers automatically make this distinction. 2. MOEQ can also be used for certain operations on data registers. -76-
4 ADDI Add Immediate ADDI Operation: Immediate Data + (Destination) Destination ADD #<data>,<ea> Add the immediate data to the destination operand, and store the result in the destination location. The size of the operation may be specified to be byte, word, or long. The size of the immediate data matches the operation size. ondition odes: * * * * * Set if the result is negative. leared otherwise. Set if the result is zero. leared otherwise. Set if an overflow is generated. leared otherwise. Set if a carry is generated. leared otherwise. Set the same as the carry bit Size Effective Address Mode Register Word Data (16 bits) Byte Data (8 bits) Long Data (32 bits, including previous word) Size field Specifies the size of the operation. 00 byte operation. 01 word operation. 10 long operation. Effective Address field Specifies the destination operand. Only data alterable addressing modes are allowed as shown: (An)+ 011 register number d(p) -(An) 100 register number d(p,i) Immediate field (Data immediately following the instruction): If size=00, then the data is the low order byte of the immediate word. If size=01, then the data is the entire immediate word. If size=10, then the data is the next two immediate words. -77-
5 SUB Subtract Binary SUB Operation: (Destination)-(Source) Destination SUB <ea>,dn SUB Dn,<ea> Subtract the source operand from the destination operand, and store the result in the destination. The size of the operation may be specified to be byte, word, or long. The mode of the instruction indicates which operand is the source and which is the destination as well as the operand size. ondition odes: * * * * * Set if the result is negative. leared otherwise. Set if the result is zero. leared otherwise. Set if an overflow is generated. leared otherwise. Set if a carry is generated. leared otherwise. Set the same as the carry bit Register Op-Mode Effective Address Mode Register Register field Specifies any of the eight data registers. Op-Mode field Byte Word Long Operation (<Dn>)-(<ea>) <Dn> (<ea>)-(<dn>) <ea> Effective Address field Determines addressing mode: a. If the location specified is a source operand, then all addressing modes are allowed as shown: An* 001 register number Abs.W (An)+ 011 register number d(p) (An) 100 register number d(p,i) d(an) 101 register number Imm * For byte size operation, address register direct is not allowed b. If the location specified is a destination operand, then only alterable memory addressing modes are allowed as shown: Dn d(an,i) 110 register number (An)+ 011 register number d(p) -(An) 100 register number d(p,i) -78-
6 otes: 1. If the destination is a data register, then it cannot be specified by using the destination <ea> mode, but must use the destination Dn mode instead. 2. SUBA is used when the destination is an address register. SUBI and SUBQ are used when the source is immediate data. Most assemblers automatically make this distinction. -79-
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