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The DA (decimal adjust for addition) instruction in the 8051 is provided to correct the aforementioned problem associated with BCD addition. The mnemonic “DA" has as its only operand the accumulator “A". The DA instruction will add 6 to the lower nibble or higher nibble if needed; otherwise, it will leave the result alone.
7 Nov 2016
5 Apr 2013 Instructions that Affecting Flags (1/2) Instruction Mnemonic Flags Affected ADD C AC OV ADDC C AC OV SUBB C AC OV MUL C="0" OV DIV C="0" OV DA A C SETB C C="1" MOV C, bit CSub: MC Topic: Arithmetic & Logical operations; 7. Instructions that Affecting Flags (2/2)
DA. The DA instruction adjusts the eight-bit value in the Accumulator resulting from the earlier addition of two variables (each in packed-BCD format), producing two four-bit digits. Any ADD or ADDC instruction may have been used to perform the addition.
2 Jan 2010 Arithmetic instructions ADD,SUB,DIV,MUL,INC,DEC.
8051 Instruction Set: ADD. Description: Description: ADD and ADDC both add the value operand to the value of the Accumulator, leaving the resulting value in the Accumulator.
17 Mar 2014 coded decimal (BCD) and allows for decimal arithmetic to be performed on what are in fact binary numbers. The assembly level command for 8051's decimal adjust is DA; and the machine code is D4H. For convenience, the 8051 instruction was retained in the WIMP51 implementation. Description of Work.
SECTION III - DECIMAL ADJUST [DA] INSTRUCTION IN 8051'DA' means decimal adjust. The decimal adjust for addition instruction is designed to correct the BCD addition problems. The decimal adjust instruction will add 6 to the lower nibble or higher nibble if needed. The example below will clarify it.
9 Oct 2017 Hello, DA A- decimal adjust accumulator after addition. how the instruction "DA A" is used in 8051 assembly language. kindly provide some examples with decimal numbers with it. can it be used to convert binary numbers into BCD? thank you!
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