Write a program to add two 8-bit number and store it in R6. The numbers are 01EH and 01CH.

Exercise Problems · Q4

Q. Write a program to add two 8-bit number and store it in R6. The numbers are 01EH and 01CH.

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Concept understanding — 8051 Arithmetic Operations

All 8051 arithmetic is carried out through the accumulator A, and memory-to-memory arithmetic is never allowed. Four operations are studied, each writing worked ALP programs in the board exam.

Addition uses ADD A,source, computing $A = A + source$ ; the source may be a register, a constant or a memory byte. A carry out of bit 7 sets the carry flag CY, and a carry from bit 3 to bit 4 sets the auxiliary carry AC. For example, $1FH + 5EH = 7DH$ .

Subtraction is done only as subtract with borrow, SUBB A,source, giving $A = A - source - CY$ . For a plain subtraction the carry is cleared first with CLR C. Internally the chip forms the 2's complement of the subtrahend (1's complement then add 1), adds it to A and inverts the carry; afterwards $CY = 0$ means the result is positive and $CY = 1$ means it is negative. …

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[!TLDR]

Add 01EH and 01CH in A and move the sum 3AH into R6.

Concept. Addition is done in the accumulator (ADD A, source); the result is then moved to the required register R6.

Program:

MOV A, #01EH   ; A = 1EH
ADD A, #01CH   ; A = A + 1CH
MOV R6, A      ; R6 = A
``` …

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Q.Write a program to add two 8-bit number and store it in R6. The numbers are 01EH and 01CH.

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