Test: Arithmetic And Logic Instructions - Computer Science Engineering (CSE) MCQ

For addition purposes the destination address must always be an accumulator. Example- ADD A,R0; ADD A, @R1; ADD A,@ DPTR

DAA command adds 6 to the nibble, if any of the nibble becomes greater than 9.

SUBB command subtracts with borrow the contents of accumulator with that of the register or some immediate value. So A-R4 is being executed.

When we divide two numbers then AC and CY becomes zero.

In 8 bit operations, if a carry is generated from D6 or D7 bit, then OV flag is set to 1.

If unsigned numbers operations are involved, then the status of CY flag is important and in signed number operation the status of OV flag is important.

These instructions are the arithmetic operations and the flags are affected by the data copy instructions, so all these instructions don’t affect the bits of the flag.

ANL instruction is used to AND the contents of the two registers and is also used to mask the status of the bits of the register.

In CJNE command, the pointer jumps if the values of the two registers are not equal and it resets CY, if the destination address is larger then the source address and sets CY if the destination address is smaller then the source address.

These commands have accumulator as the destination address and any register, memory or any immediate data as the source address.