Adds the source operand to the destination operand along with the extend bit, and stores the result in the destination location. The addition is performed using binary-coded decimal arithmetic. The operands, which are packed binary-coded decimal numbers, can be addressed in two different ways:
- Data Register to Data Register
- The operands are contained in the data registers specified in the instruction
- Memory to Memory
- The operands are addressed with the predecrement addressing mode using the address registers specified in the instruction.
This operation is a byte operation only.
| Operation: | ABCD | ||||||||||||||||||||||||||||||||||||||||||||
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| Syntax: | ABCD Dy, Dx ABCD -(Ay), -(Ax) | ||||||||||||||||||||||||||||||||||||||||||||
| Data Size: | Byte | ||||||||||||||||||||||||||||||||||||||||||||
| Flags: |
X Set the same as the carry bit N Undefined Z Cleared if the result is nonzero; unchanged otherwise V Undefined C Set if a decimal carry was generated; cleared otherwise Normally, the Z condition code bit is set via programming before the start of an operation. This allows successful tests for zero results upon completion of multiple-precision operations. | ||||||||||||||||||||||||||||||||||||||||||||
| Format: |
Rx the source register. Ry the destination register. R/M Specifies the operand addressing mode:
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