DAA

Name	Decimal Adjust Accumulator
Function	If the contents of the accumulator are greater than 9, or if the carry bit = 1, the accumulator is incremented by 6. Otherwise, the accumulator is not affected.
Syntax	DAA
Assembled
Binary	11111011
Decimal	251
Hexadecimal	0xFB
Symbolic
Execution	1 word, 8-bit code and an execution time of 10.3 \({\mu}\) sec
Side-effects	As Described
Implemented	daa

Detailed Description

If the contents of the accumulator are greater than 9, or if the carry bit = 1, the accumulator is incremented by 6.

Otherwise, the accumulator is not affected.

If the result of incrementing the accumulator produces a carry out of the high order bit position, the cary bit is set.

Otherwise the carry bit is unaffected (in particular it is not reset).

Notes

This instruction is used when adding decimal numbers. For an example of this see Decimal Addition:

The opcode for this instruction does not contain any additional data: